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1、四年级第一单元（Grade 4 Unit 1）知识点汇总1. Let sb. do sth. 让某人做某事例如：Let me help you. Let us go! ( let us= lets )2. clean v. 打扫，清洁例如：clean the window 擦洗窗户clean the classroom 打扫教室clean the board(= blackboard) 擦黑板clean the fish bowl 擦洗鱼缸 clean the desk 擦桌子adj. 干净的，清洁的 (dirty adj. 脏的，脏乱的)例如： Our classroom is very c
2、lean.3. Where is/ are sth. ? 某物在哪里？例如：Where is my book?Where is his pen?Where are her friends?Where are their chairs?4. open the door turn on the light sweep the floor clean the window put up the picture clean the board 5. 表示拥有 have 和there be句型的用法通常，表示某人拥有某物时，用have我有一只小猫。 他有一台电脑。 他们有一些书。 表示某处有某物，客观地
3、陈述某物位于某地，可以用There be句型（be 在这里有is 和are两种形式）教室里有一块黑板。 教室里有六盏灯。 大街上有许多人。 6. have a look 看一看look at sth. 看（强调“看”的动作）see（强调看到的具体内容）例如：May I have a look?Look at that car!Please look at the teacher.I see a cute dog.7. 表示位置时介词in on at的用法应用：What is in your bag?What is on the desk?Who are in the room?What are
4、 on the playground?in 在里，在（较大的地方）在土里 在房子里 在中国 在西安 On 在上在桌子上 在操场上 At 在（较小的地方）在家8. Excuse me! After you! 9. this that these those的用法this adj. (后可接单数名词) This dog is cute. n. This is my desk.that adj. (后可接单数名词) That woman is my mother.n. That is my cup.these adj. (后可接复数名词) These books are very interesting.n. These are our books.Those adj. (后可接复数名词) Those trees are green. n. Those pictures are nice!