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1、Section ASection AGrammar Focus 4a-4cGrammar Focus 4a-4c1.What does Mario volunteer to do?2.What did Mary volunteer to do?3.Why do they volunteer to help others?Review:语法:动词不定式构成：to+动词原形do (有些动词不定式不带to)动词不定式是一种非谓语动词。动词不定式（短语）可充当的句子成分有：主语、宾语、表语、定语、补语、状语。动词不定式保留动词的某些特征，其后可接自己的宾语、状语等，并与其构成短语，即动词不定式短语。1
2、.动词不定式在句中作主语 Toknowsomeoneisdifficult.Itsimpossibleforustoliveinaplacewithoutwaterfortoolong.2.动词不定式在句中作宾语（动词的宾语）常见的动词有：want、hope、plan、decide、agree、forget、stop、try等 Do you want to drink something?I forgot to bring my Chinese book to school.Linda forgot telling me this news,and she told me again.3.动词
3、不定式在句中作表语 Mydreamistobeaclimber.Themostimportantoneistobecarefulwhenyouhaveanexam.4.动词不定式在句中作定语 Reading much is the best way to learn English well.Do you have anything to say on the question?5.动词不定式在句中作宾语补足语（动词+sb.+to do）常见动词有:want、ask、invite、tell、teach、help、get、allow、order等Jimmywantshermothertobuya
4、newbikeforher.有些动词后的不定式作补语去掉to,动词有感官动词（see、hear、feel、notice等）和使役动词have、let、make等。Springisacomfortableseason,letsgohiking.Iheardsomeonesinglastnight.6.动词不定式在句中作状语（常表示目的、结果 等）Hegotupearlytocatchthefirstbus.(目的)Imgladtoseeyou.(原因)Thegirlisoldenoughtolookafterherself.（结果）巩固练习1.Our duty is to protect the
5、 environment.（）2.It took us a whole week to finish the work.（）3.The next plane to reach is from HongKong.（）4.Lucy agreed to help me with my grammar.（）5.Tomorrow,Ill fly to Chengdu to visit an old friend.（）6.Our headmaster doesnt allow students to take mobile phone to school.（）表语主语定语宾语状语补语4cComplete
6、the sentences with your own ideas.Use infinitives.1.Id like to volunteer _.2.At 12:00 a.m.,I called my friend _.3.Im very busy but I could help _.4.Summer vacation is coming,and I want _.5.I want to travel alone.My parents told me(not)_.put off call upcome up with cheer up put up hand outgive out to make to do to helpto spend to visit to move