单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,2020/11/17,#,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,2020/11/17,#,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,2020/11/17,#,动词不定式,动词不定式,动词不定式的定义,动词不定式是一种活跃的非谓语动词。它在句中,作主语、宾语、定语、状语或宾语补足语,。,动词不定式结构：,to+,动词原形,否定形式：,not to do,动词不定式的定义动词不定式是一种活跃的非谓语动词。它在句中作,动词不定式的用法,1.,动词不定式,作主语,。动词不定式作主语时，也可以放在后面，而用,it,作形式主语,放在原主语的位置上。,To see,is to believe.,It,s hard,to reach,the apple.,Its+,形容词,+to do sth.,作主语,动词不定式的用法1.动词不定式作主语。动词不定式作主语时，,动词不定式的用法,2.1,动词不定式,作宾语或宾语补足语,（宾语,+,宾语补足语）。常接不定式作宾语或宾补的动词有：,refuse,agree,begin,start,decide,choose,tell,learn,want,wish,advise,show,等等。,He,wants to find,him quickly.,I,decided to work,in Shenzhen.,作宾语,/,宾语补足语,动词不定式的用法2.1 动词不定式作宾语或宾语补足语（宾语+,动词不定式的用法,2.2,在复合宾语中，这时可以把不定式放在补足语后面，而用,形式宾语,it,代替它。,I find,it,easy,to learn,English well.,作宾语,/,宾语补足语,动词不定式的用法2.2 在复合宾语中，这时可以把不定式放在补,动词不定式的用法,3.,疑问代词,what,who,which,和疑问副词,when,where,why,how,后接动词不定式，在句中作主语、宾语、表语等成分。,When to start,has not been decided.,We cant decide,which one to buy,.,The question is,how to get there,.,疑问词加不定式,(,作主语）,（作宾语）,（作表语）,动词不定式的用法3.疑问代词what,who,whic,漫画中的有哪些动词不定式？漫画用到了动词不定式的哪些用法？,看漫画找规律,漫画中的有哪些动词不定式？漫画用到了动词不定式的哪些用法？看,Sally is learning,to play,the violin.,Sally is learning to play the,Her teacher is showing her,how to hold,the bow.,Her teacher is showing her how,At first she finds it hard,to make,a nice sound.,At first she finds it hard to,Her teacher gives her some music,to practise,before her next lesson.,Her teacher gives her some mus,易错点,1,省,to,动词不定式的动词,“,一感二听三让四看半帮助,”,feel sb do sth;listen/hear sb do;look at/see/watch/notice sb do sth;make/let/have sb do sth;help sb(to)do sth,一感指,feel,；二听指,listen(to),，,hear,；,三让指,let,，,make,，,have,；,四看指,see,，,look(at),，,watch,，,notice,；,半帮助指,help,，,help,后,to,可有可无。,易错点1省to动词不定式的动词“一感二听三让四看半帮助”fe,易错点,1,省,to,动词不定式的动词,I often,hear,Molly sing songs in her room.,Dont,make,him stand outside.,I often help the old(to)cross the road.,易错点1省to动词不定式的动词I often hear Mo,易错点,2,既可跟不定式又可跟动名词作宾语的动词,有些动词，既可跟不定式又可跟动名词作宾语，但表达意义完全不同。,forget,to do sth.,忘记去做某事,doing sth.,忘记做过某事,（未做）,（已做）,类似的动词：,remember,易错点2既可跟不定式又可跟动名词作宾语的动词有些动词，既可跟,易错点,2,既可跟不定式又可跟动名词作宾语的动词,Dont forget,to close,the door when you leave.,I forgot,posting,the letter.,（未做）,（之前忘记，但现在已经做过）,易错点2既可跟不定式又可跟动名词作宾语的动词Dont fo,易错点,2,既可跟不定式又可跟动名词作宾语的动词,go on,to do sth.,接着去做另一件事,doing sth.,继续做同一件事情,（另一件事情）,（同一件事情）,类似的动词：,stop/continue,易错点2既可跟不定式又可跟动名词作宾语的动词go onto,易错点,2,既可跟不定式又可跟动名词作宾语的动词,The students stopped,talking,when the teacher came in.,After a long walk,they stopped,to have,a rest.,（另一件事情）,（同一件事情）,易错点2既可跟不定式又可跟动名词作宾语的动词The stud,易错点,2,既可跟不定式又可跟动名词作宾语的动词,see,sb do sth.,看见做过某事,sb doing sth.,看见正在做某事,（强调结果）,（强调过程，正在做）,类似的动词：,hear/see/watch/notice,易错点2既可跟不定式又可跟动名词作宾语的动词seesb do,易错点,2,既可跟不定式又可跟动名词作宾语的动词,We,often,see Annie,shop,in the supermarket.,Wang Ping saw an old man,lying,on the road.,（强调过程）,（含,often,，强调结果）,易错点2既可跟不定式又可跟动名词作宾语的动词We often,易错点,3,it,作形式主语句型中介词的用法,Its+,形容词,+,for,+sb+to do sth.,形容词为“物的属性”时用,for,。,Its important,for,us to save water.,Its+,形容词,+,of,+sb+to do sth.,形容词为“人的属性”时用,of,。,Its nice,of,you to say so.,易错点3it作形式主语句型中介词的用法Its+形容词,Parents often ask their kids _ their Internet friends because the kids may be in danger.,A.to meet B.meet,C.not to meet D.meeting,典例,1,Parents often ask their kids _,Dad,why must I stop _?,For your health,my boy.,A.sleep B.to sleep,C.to sleeping D.sleeping,典例,2,Dad,why must I stop _?典,