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动词不定式是由“to+动词原形〞构成 (有时可以不带to)。
其否定形式是“not+动词不定式〞(not不与助动词连用)。
它属于一种非谓语动词的形式，在句子中不能充当谓语，没有人称和数的变化，但它可以保留动词的性质，其本身可以带宾语或状语等附加成分〔不定式和其附加成分称为不定式短语〕。
动词不定式〔短语〕的句法功能非常广泛，在句中可作主语、宾语、补足语、表语、定语及状语等成分。
一、作主语〔1〕动词不定式作主语时，谓语动词常常用单数。
例如：To do morning exercises is useful for our health. 做早操有利于我们的健康。
To sweep the floor is my duty every day. 每天打扫地板是我的责任。
〔2〕如果动词不定式太长，常常用 it 作形式主语，而将真正的主语——动词不定式后置。
例如：It took me half an hour to walk there．我走到那儿花了半小时的时间。
It’s important for us to learn English well．对我们来说，学好英语是重要的。
二、作宾语〔1〕能够接动词不定式作宾语的有〔固定结构〕 ask, agree, beg, decide, determine, fail, hope, manage, offer, plan, prepare, pretend, promise, refuse, wish 及 would like/love 等动词，但 finish, enjoy, miss, appreciate, mind, advise, suggest 等动词后面通常只能接动名词作宾语。
例如：I hope to visit this place again. 我希望能再度访问此地。
She enjoys reading very much．她非常喜欢读书。
The driver failed to see the other car in time. 司机没能及时看见另一辆车。
Non-restrictive Attributive ClausesLesson PlanTeaching aims:1. Teach students the differences between non-restrictive attributive clauses and attributive clauses.2. Teach students how to use the link words (which, who, whom, as, when, where), especially for the usage of which are different from that in attributive clauses.3. Finish the exercise on how to use these link words in attributive clauses. Teaching difficulties:1. Teach students how to use the link words (which, who, whom, as, when, where), especially for which are different from the usage in attributive clauses.2. Finish the exercise on how to use these link words in attributive clauses Teaching methods:municative Language Teaching Method.2.Task-based.3.Grammar Teaching Method.Teaching aids:puter2.HandoutTeaching steps:Step one-revision-attributive clauses1.I have a friend________ likes listening to the classic music.2. The man _____ leg was broken in the match used to be a football player.3. My parents live in a house _____ is over 100 years old.4. The boy with ______ John spoke is my brother.5. This is the reason ______Ｉam late for school6. Beijing is a city _____Ｉwas born.7. I still remember the day _____ I met him.Step two- the differences between non-restrictive attributive clauses and attributive clauses.a)An example of non-restrictive attributive clauses.b)The differences between non-restrictive attributive clauses and attributive clauses. Step three- the usage of “who”, “whom.”a)Examples.b)Students’ conclusion.c)Exercise.Step four-the usage of “which”.a)Examples.b)Students’ conclusion.c)Exercise.Step five-the usage of “as”.d)Examples about “which” and “as”e)Students’ conclusion about the differences between “which” and “as”.f)Exercise.Step six- the usage of “when” and “where”.ExamplesStep seven-conclusion on what we learned in this class.1. 在非限制性定语从句中，先行词为人时关系词只能用______做主语，用______ 做宾语。
Revising useful structures---the infinitive What is the infinitive?The infinitive of a verb is considered the “base” form; it is the form that is listed in dictionaries. It can be introduced by a modal verb, an auxiliary verb, a certain limited class of main verbs or by a main verb followed by the particle to, which is illustrated in the following table.Features of the infinitive不定式的特征不定式有带to的不定式和省略to的不定式两种。
不定式不能作句子的谓语，但它具有动词的一些特征，可以带有自己的宾语、状语以及逻辑主语等。
1及物动词的不定式形式，其后可以跟宾语。
I like to read detective novels.2不定式可以被状语修饰。
I was told to drive the car carefully and slowly.3不定式没有人称和数的变化，不受主语的人称和单复数的限定或影响。
She likes to play the piano.I hope to finish reading the book tonight.4不定式复合结构的构成为for/of sb. to do sth. , 其中sb.是不定式的逻辑主语。
It is really difficult for me to learn dancing.It’s impolite of you to visit someone without telling him in advance. 在不定式复合结构中，当形容词说明不定式的特征时，逻辑主语用for 引出；当形容词说明逻辑主语特征时，逻辑主语用of引出。
