1. 动词-ing形式的构成：是在动词末尾 加 -ing 形式构成，因此又叫动词的 - ing 形式（细分为动名词和现在分词）。如：do-doing, be-being, ask-asking, etc.否定形式：not+ -ing 构成2. 动词-ing形式不能单独作谓语，没有人称和数的变化，但可以有自己的宾 语和状语，还有时态和语态的变化。动名词：在句子中起名词作用，可作 _,_,_,_主语 宾语表语定语动名词的形式主动形式被动形式一般 式doingbeing done完成 式having donehaving been done1 The ving form used as subject:It is necessary to get water from wet to dry place. Getting water from wet to dry places is necessary.It cost nothing to wish for thing.Wishing for things cost nothing.2 .The ving form used as objectHe likes helping others.只接v-ing作宾语的动词有： admit, allow, avoid, appreciate, Object v. +object prep. + object 1) v+objectconsider, delay, escape, enjoy, finish, keep, imagine, mind, miss, practice, suggestHe suggested practising speaking English in and out of class.只接v-ing作宾语的词组有give up, put off, insist on, look forward to, pay attention to, lead to, devote. to, make a contribution to, feel like, stick toHe has devoted his life to finding ways to grow more and more rice.2) prep.+ object.His problem is getting to know more friends.My job is teaching.a drinking cupa dancing halla washing machine a cooking pan3 The ving form used as predict:4 The ving form used as attribute:1. 动名词和不定式作主语，一般都可以使用形式主语it it，而将动名词或不定式放在句尾。但是在下列句型中，一般宜用动名词，不宜用不定式来代替：Its no use doing Its no good doing Its a waste of time doing 例如：Its no use going there today; he wontbe at home.Its a waste of time arguing about it. 而在Its important/necessary/advisable/ essential/fitting 这类句型中，只能用 不定式，如： Its important to learn foreign languages.2. 在allow, advise, forbid, permit后直接跟动名词作宾语，如果有名词或代词作 宾语，则构成“ allowadviseforbid permit 名词代词不定式（宾语补 足语）”之形式。如：We dont allow smoking here We dont allow anybody to smoke here 3. 动词need, require, want意为“需要”时，后跟动名词的主动式或不定式的被动式作宾语，意义没有区别。如： The window needsrequireswants cleaningto be cleaned 4. 在begin, continue, love, like, hate, prefer, intend, start 后用动名词和用不定式作宾语均可，意义没有多大区别。 5. 动词forget, go on, mean, regret, remember, stop, try, be used to, cant help后跟动名词和跟不定式区别较大，须注意: forget, regret, remember后跟动名词，动名词表示已经发生的动作；后跟不定式表示将要发生的动作。 go on doing 继续继续 做原来做的事go on to do 接着做另一件事 mean doing 意味着要做某事mean to do 想要做某事 stop doing 停止做某事stop to do 停下来（别别的事）开始做某事try doing 试试着做某事try to do 努力做某事be used to doing 习惯习惯 于做某事 be used to do 被用来做某事cant help doing 禁不住做某事cant help to do 不能帮助做某事 Lets have a rest Not now. I dont want to stop _ yetA. study B. to study C. for studying D. studying 解析：stop studying意为“停止学习”。 Let me tell you something about the journalists Dont you remember _ me the story yesterday？A. told B. telling C. to tell D. to have told 解析: remember telling me意为 “记得曾经告诉过我”。 怎么判断是动名词还是现在分词呢？在做定语的时候：a drinking cupA cup is drinking.the sleeping boyA boy is sleeping.a cooking panA pan is cooking.找出右边成立的句子。如果讲得 通就是现在分词，否则就是动名词。动名词动名词现在分词现在分词作定语表示动作。如果是单词，放在被修饰的名词前；如果是短语，放就放在被修饰的名词之后。动名词作定语表示性质或用途。总结：1. It took the workmen only two hours to finish _ my car. A. repairing B. repair C. to repair D. repairedExercise2. Have you forgotten _$1000 from me last month? Will you please remember _ it tomorrow? A. borrowing; to bring B. to borrow; bringC. borrowed; bringing D. borrowing; bringing3. My brother keeps _ me with my work. A. to help B. help C. helping D. helped 4. We should often practise _ English with each other.A. to speak B. spoke C. speak D. speaking5. The story was so funny that we _. A. couldnt help laugh B. cant but laugh C. couldnt help laughing D. couldnt help but to laugh6. Though it sounds a bit too dear ( 昂贵), it is worth _. A. being bought B. buying C. to buy D. buying it 7. He devoted his life to _ the atomic theory. A. study B. be studied C. studying D. have studied8. We are both looking forward to _ next week. A. going on vocation (休假) B. go on vocation C. be going on vocation D. have gone on vocation9. The microscope is used for_ minute (微小的) objects. A. examining B. being examined C. examined D. examine10. Mike has got used _ up late at night. (stay up) A. to sit B. X C. to sitting D. sitt