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1、 Grammar Explorer 3Answer KeyUNIT 1 FamilyPresent and Past: Simple and Progressive10. Im staying/I am staying11. surprises12. gorillas laughLESSON 1Simple Present and Present Progressive13. Do you follow/Are you following14. Im doing/I am doing15. makesEXPLOREExercise 2 CHECK, page 516. Young chimps
2、 and gorillas stay17. Chimp fathers usually dont stay/Chimpfathers usually do not stay12345. False. True. True. False. True18. rarely leaveExercise 5, page 71. is growing2. are gettingExercise 3 DISCOVER, page 5A3. are growing4. is increasing5. always go6. compare7. always take care of123. b. b. a8.
3、 s always getting/is always gettingB9. s becoming/is becoming10. is always complainingThis verbSimplePresentform shows presentthat theaction isprogressiveExercise 6 ANALYZE THE GRAMMAR,page 81. permanent. 1. A change over time: 1, 2, 3, 4, 923. An unwanted repeated action: 8, 10. A regular or expect
4、ed action: 5, 6, 72. a routine or habit. in progress3PRACTICEExercise 7, page 8now or over acurrent time.123456789111. m enjoying/am enjoying. m staying/am staying. do. take. dont eat/do not eat. use. m getting/am getting. speaks. is improving0. often laughs1. doesnt bother/does not bother2. often m
5、akeLEARNExercise 4, pages 6-7123456789. do you find. I go. does it take. It usually takes. we dont/do not find. Are the trackers following. The trackers are spending. exploring. are you stayingAnswer Key for Grammar Explorer 3 National Geographic Learning, a part of Cengage Learning.1 6. dExercise 8
6、 WRITE & SPEAK, pages 8-9AB12. Do you eat with chopsticks at every meal?. Does your family remove their shoes insideAnswers will vary. Possible answers:Julias grandmother never drives at night.Julias grandmother still drives.Julias father is standing next to her brotherAlex.Her twin sister Ana plays
7、 in an orchestra.Her brother Lucas is studying in Scotland.Her whole family doesnt get together toooften.the house?345678. What are you getting better at?. Does anyone in your family speak English?. What language do you speak at home?. Who do you live with?. Is your English improving day by day?. Do
8、 you ever laugh at your mistakes inEnglish?Exercise 12 EDIT, page 11BThis week I visit am visiting my twin sister.We arent getting dont get together oftenbecause we live a couple of hours apart. Wetalk and text all the time, though, so wedont feel too far apart. We are telling telleach other our pro
9、blems and try to help eachother out. Another reason we dont see eachother often is my sisters job. She is verybusy. We often make plans, but she iscancelling always always cancelling ourplans at the last minute. Sometimes thisupsets me. Its almost summer, though, soher schedule becomes is becoming m
10、uchless busy. This week, at least, we do aredoing a lot together. Its great!Answers will varyExercise 9, page 9A123456. is always borrowing; not returning. are always checking; texting. is always complaining. are always making. is always talking. is always losingExercise 10, page 10A12. are living.
11、is decreasing; isnt increasing/is notincreasing. isnt going/is not going; s coming/iscomingLESSON 2Stative Verbs345. are getting; are waiting. arent having/are not having; reEXPLOREExercise 2 CHECK, page 131. dont want/do not want2. arent having/are not having3. isnt only one/is not only one/more th
12、anonehaving/are having67. are continuing. are growingExercise 11 LISTEN & WRITE, page 10A4. dont have/do not have12345. b. c. e. a. fExercise 3 DISCOVER, page 13A1. is thinking2. think3. is lookingAnswer Key for Grammar Explorer 3 National Geographic Learning, a part of Cengage Learning.2 456. looks
13、. are having. have(b) is seeing6. (a) is looking(b) looks7. (a) am smelling(b) smellsB12. 1, 3. 2, 4, 5, 68. (a) is coming(b) comesLEARNPRACTICEExercise 4, page 14Exercise 8, page 161. A: are you tastingB: It doesnt smell/does not smell2. A: Do you haveB: Im/I am3. A: do you look; are you thinkingB:
14、 we need4. A: You seem12345678. S. A. S. A. S. S. A. SB: I missExercise 5, pages 14-15Exercise 9, pages 16-17123456. A: Do people haveB: Many families have. A: Do most people ownB: most people dont/do not own. A: Does it costB: it costs. A: do you thinkB: I hope. A: Do you knowB: it seems. A: do you
15、 look likeB: I resemble1. like2. s/is3. love4. comes5. has6. dont always agree/do not always agree7. m watching/am watching8. are having9. s/is/s being/is being10. sounds11. seems12. doesnt resemble/does not resemble13. hasExercise 6 SPEAK, page 15Answers will vary14. loves15. own16. seeExercise 7,
16、pages 15-1612345. (a) has(b) is having. (a) think(b) am thinking. (a) weighs(b) is weighing. (a) isnt being(b) isExercise 10, page 171. seem2. isnt/is not3. resembles4. doesnt have/does not have5. has6. s/is7. weighs8. doesnt need/does not need. (a) doesnt seeAnswer Key for Grammar Explorer 3 Nation
17、al Geographic Learning, a part of Cengage Learning.3 91. sees0. knows7. knew8. stayed9. performedExercise 11 APPLY, page 1710. foundA11. didnt enjoy/did not enjoy12. likedAnswers will vary13. was readingB14. was playing15. threwAnswers will vary16. wasnt lookingLESSON 317. hitSimple Past and Past Pr
18、ogressive18. felt19. wasEXPLOREExercise 2 CHECK, page 19Wording may vary, but answers shouldinclude the main ideas.B1. did Carly stay2. did Tori perform3. was reading4. happened5. did Sam feel6. did you prefer1. Over 2000 sets of twins were at thefestival. Some of the festival events were picnics,ta
19、lent shows, parades, and contests. Scientists and technicians were doingserious work at the festival. It was hard to tell them apart because their23C4Answers may vary. Possible answers:beards covered half of their faces.1. Because she was sick.2. Because Carly was sick.Exercise 3 DISCOVER, page 19A3
20、. Sam was.4. He wasnt looking, so he missed the balland it hit him on the arm.123. was walking; stopped. were photographing; collecting; scanning. looked; didnt see5. Because his twin had been hit on his arm.Exercise 5, page 221. sawB123. simple past; past progressive. simple past. simple past2. wer
21、e driving3. were drinking4. When5. liftedLEARNExercise 4, pages 20-21A6. was leading7. when8. was playing9. fell10. got11. decided12. when123456. liked. preferred. had. practiced. played. woke upPRACTICEAnswer Key for Grammar Explorer 3 National Geographic Learning, a part of Cengage Learning.4 Exer
22、cise 6 WRITE & SPEAK, page 23B12. didnt want13. did1. When Julios grandparents were living inJapan, they didnt know each other. They each emigrated to Peru when theysaved enough money. Julios grandparents were working on asugar plantation when they met. Julios father, Jiro, was born while theylived/
23、 were living on the sugar plantation. When Jiro turned six, the family moved toLima, so he could go to school. Jiro worked in the family store while hewent/ was going to high school. When Jiro saw Susan at school, heintroduced himself. When Jiro and Susan were attending14. looked15. arrived16. trave
24、led17. While18. knew19. were23420. found21. was5Exercise 8 EDIT, page 25AErica: Hello?Mother: Hello, Erica? Were you asleep?Was I waking Did I wake you up?Erica: Yeah. I slept was sleeping. I didntsleep well last night, so I decided to take anap.678college in Lima, they got married.CMother: Oh, Im s
25、orry. I just was wantingwanted to say hello.Answers will varyErica: Well, I had was having the strangestdream when the phone rang. I talked wastalking to Aunt Jelena. We were sitting inher living room. While we were talking, abear suddenly was appearing appeared. Itwas terrifying! When the bear came
26、 towardus, we were running ran outside. Thatswhen I heard the phone.DAnswers will varyExercise 7 LISTEN, page 24A123456. Bella. Bellas mother. Marina. Maria and Marina. Maria. MarinaMother: That sounds like a scary dream!Erica: It was. It was a very strange dream.Im glad I was waking up woke up.B, p
27、age 25BEricas Dream1. Where was Ericain her dream?Notes12345678911. was cleaning. when. was looking. came. When. became. told. Maria. Marina0. when1. was packingIn Aunt Jelenasliving room.They were talking.2. What was shedoing?34. What happened?. What did they doA bear suddenlyappeared.They ran outs
28、ide.when the bear cametoward them?5. How did she feelShe was glad whenshe woke up.when she woke up?Answer Key for Grammar Explorer 3 National Geographic Learning, a part of Cengage Learning.5 “Do you leave already Are you leavingExercise 9 APPLY, page 25already?” These comments upset me, soAnow I th
29、ink Im thinking about changingAnswers will varyjobs. Anyway, enough about me. What doyou do are you doing nowadays? WriteBsoon!Love,CarlosAnswers will varyREVIEW THE GRAMMARExercise 1, page 26Exercise 3 LISTEN, page 27A1234567891111111. dont have/do not have. feel. dont know/do not know. believe. th
30、ink. wasnt/was not. went. played. was growing0. gave1. didnt get/did not get2. are deciding3. costs4. are waiting/wait5. have1. False2. True3. False4. False5. TrueB1. love, dont2. know, know, knew3. is4. Im not talking5. didnt fight6. show, fightExercise 4 SPEAK & WRITEA6. dont plan/do not planAnswe
31、rs will varyExercise 2 EDIT, page 26Hi Anna,BHow do things go are things going?Answers will varyEverything is great with Emily, Max, andme. Max grows is growing day by day. Hesfour months old now. He is getting big!Emily is working part time now. She wasgoing went back to work last month, soshes alw
32、ays really tired. Its too bad babiesarent sleeping dont sleep through the night.Max wakes up two or three times a night.Im lucky. Im never waking up I neverwake up. Emily does.I need my sleep. Im working longhours these days. On top of that, my boss isalways complaining about something. Theother day
33、, at 6:00 p.m., while I walked waswalking out the door to go home, he said,Answer Key for Grammar Explorer 36National Geographic Learning, a part of Cengage Learning. CONNECT THE GRAMMAR TOWRITINGCShort Essay Question Why do manychildren in theirExercise 1, pages 28-29B20s and 30s stilllive with the
34、irVerb formPresentprogressiveExampleis increasing trendare livingUseparents?In the past,children left homeas soon as theycould afford it.Today, manyIn the PastTodaytemporarysituationtrendtrendstative verbfactfactis affectingare takingis differentcannot findthey returnhomeSimplepresentyoung adultscan
35、not find jobs,so they returnhome; this alsoallows them tosave money.This new trendputs a strain onparents, who faceeconomicchallenge becauseof their childrenand may have topostponethey wantget toostative verbstative verbFinal Thoughtscomfortablefaceeconomicchallengesit seemsleft home;left hisparents
36、house; wentto college;he got a job;neverstative verbstative verbpastexamplesSimple pastretirement.Exercise 2 BEFORE YOU WRITE, page29returnedAAnswers may varyWhy are people living longer?BAnswers may varyExercise 3 WRITE, page 29Answers will varyAnswer Key for Grammar Explorer 3 National Geographic
37、Learning, a part of Cengage Learning.7 UNIT 2 PassionsPresent and Past: Perfect and PerfectProgressiveExercise 6, page 361. have enjoyed; for2. has been; sinceLESSON 13. has had; forPresent Perfect4. have wanted; for5. hasnt played/ has not played; sinceEXPLOREExercise 2 CHECK, page 336. hasnt parti
38、cipated/ has not participated;for12345. d. e. b. a. c7. has always jumped; since8. have loved; sinceExercise 7, page 371. (a) has dreamed(b) dreamedExercise 3 DISCOVER, page 33A2. (a) have never photographed(b) didnt photograph3. (a) went(b) has gone4. (a) havent seen(b) didnt see12345. grew up; lea
39、rned. has loved. has spent. has followed; dived; studied. approached; gotPRACTICEExercise 8, page 37A1. reduced2. fullB123. 1, 5. 3, 4. 23. reducedLEARNExercise 4, page 354. reduced5. reduced6. full7. full8. reduced1234567891. Ive learned/I have learned. Have you seen. I havent/I have not. Ive never
40、 heard/I have never heard. He has lived. worked. He has taken. Mr. Chin has just canceled. Has he rescheduled0. Have you ever hadExercise 9, page 38A1. have you been2. I have had3. did you become4. I was5. snakes have fascinatedExercise 5 ANALYZE THE GRAMMAR,page 356. I was7. I did not read/I didnt
41、read8. I often volunteered9. I majored123. 5, 6. 1, 2, 3, 4, 7, 10. 8, 910. you spentAnswer Key for Grammar Explorer 3 National Geographic Learning, a part of Cengage Learning.8 1111111. I really enjoyed2. Have you ever experienced3. I have worked4. only one has bitten5. I have paid more attention6.
42、 I have been able3. Did you visit any interesting places whenyou were a child?4. Have you visited any interesting placesrecently?5. What dreams for the future did you haveas a child?6. What goals have you achieved in the lastExercise 10 EDIT, page 39few years?Dear Ms. Ramos,I am writing to apply for
43、 the positionBof staff photographer that I have seen saw onyour website. I believe that my experiencehas prepared me well for this job.Answers will varyExercise 12 APPLY, page 40Photography is my passion. I lovedAhave loved photography ever since I was achild. That is when I have gotten got myfirst camera. The thrill of taking pictures hasnever gone away, but my interests havechanged over the years. While I was