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1、1 性质：它具有动词的特点，但在句子中起着名词、形容词、副词的作用，充当主语、表语、定语、宾语、宾语补足语、状语的作用，即：除谓语以外的一切成分。非谓语动词2形式不定式 相当于名词、形容词、副词。充当主语、宾语、定语、表语、宾语补足语、状语。动名词 相当于名词充当主语、表语、定语、宾语.分词 相当于形容词、副词。作表语、定语、宾语补足语、状语。一 动词不定式 The Infinitive(to do)不 定 式 的作 用不定式的时态不定式的语态不定式1.主语2.宾语3.宾语补足语4.表语5.定语6.状语 1._(talk)with him is a great pleasure.2._(hel
2、p)others is our duty.To talkTo help3.如果要说明不定式表示的动作是谁做的，可以在不定式前加一个由 for 引起的短语,构成不定式的复合结构。2.不定式作主语时,可以用it作形式主语.It is our duty to help others4.It is+adj+for sb to do It is+adj+of sb to do4.It is important _ Tom to get that job.It is kind _ you to help me with myforof1不定式作主语：3.It is easy_ _(学生读)(adj:kin
3、d,good,nice,wise,unwise,clever,silly,stupid,foolish,careless,rude,polite,naughty（修饰人的形容词）（修饰物的形容词）1.单个不定式作主语，谓语动词单数for the students to read.1.Her work is _(look)after the children.2.My aim is _(go)to TsingHuaUniversity.3.She seemed _(think)about the problem.4.They appeared _(agree)with what we said.
4、to lookto goto thinkto agree2不定式作表语不定式作be动词的表语时可以和主语部分调换，说明主语的内容。：want,demand,hope,wish,expect,fail,help,offer,manage,pretend,promise,prepare,learn,agree,plan,determine,prefer,intend.1.They wanted _(get)on the bus,didnt they?2.He said he wished _(be)a professor.3.I agreed_(go)there with the doctor.4
5、.He had promised _(give)me a hand.to getto beto goto give3不定式作宾语：1.He found _Russian.(study/important)2.The computer makes_(possible/calculate faster)如作宾语的不定式有自己的补语，须用先行词 it作 形式宾语，而将真正的宾语不定式后置。有些及物动词常用不定式作宾语。常见的动词有it important to studyit possible to calculate faster.句式：Subject+v+it+adj/n+to dothink,
6、find,feel,consider,make1.He seldom comes except _at my pictures.(look)2.We have no choice but _outside.(wait)3.They could do nothing but _for help.(ask)不定式一般不能作介词的宾语，只有在极少数介词如：but,except等后才行，此时不定式可带 to 或不带 to。注意to lookto waitask 5看（look at,see,watch,notice,observe）3使（make,let,have）；2听（listen to,hear
7、）；1感觉（feel）。1.The teacher made the boy_(go)out of the classroom2.We observed them_(finish)the work3.He was made_(tell)a story4.Let us_(have)a rest.5.The teacher got the students _(hand)in homework.“吾看三室两厅一感觉”主动语态 s+v+sb+do.被动语态。S+be+v ed+to do A 1.I didnt want my parents _(help)me.2.Wed prefer you _
8、(take)the job instead of Zhang.B4.不定式作宾语补足语.+V+sb to dogohave to hand to tell to help to takefinish let sb do sth get sb to do sth1.He was the first person_to the classroom(come)2.Do you have anything_?(say)3.He thought out a plan _(punish)Tom.to say to come to punish 4.We need a room to live5.We have a lot of problems to talk作定语的不定式如是不及物动词，不定式后面须有相应的介词。5.不定式作定语inabout