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be 動詞后 不一定加 動詞 ing，也可以加動詞ed（過去分詞）

be + 動詞ing 表示進行時態
eg. I am watching TV

be + 動詞ed 表示被動

eg The kite was made by Jim

在什么情況下，動詞后面加“ing”？

be動詞(is.am.are).介詞后面加ing形式。還有固定的詞組搭配要記住

某些動詞后出現非限定性動詞時只能用動名詞作賓語，不能用不定式。常見的此類動詞有：advise, allow, permit, avoid, consider, enjoy, finish, give up, cannot help, imagine, include, keep, keep on, mind, miss, put off, delay, practise, resist, suggest, depend on, think about, set about, succeed in, worry about, burst out, insist on, can’t stand, be used to, get used to, devote…to…, look forward to, pay attention to, get down to等。如：

They went on walking and never stopped talking. 他們繼續走，說個不停。

I found it pleasant walking along the seashore. 在海灘上走真是樂事。

（2）作介詞的賓語

We are thinking of making a new plan for the next term. 我們正考慮為下學期制定新的計劃。

Shall we have a rest or get down to doing our work? 我們休息呢還是開始干活？

（3）作形容詞的賓語

The music is well worth listening to more than once. 這種曲子很值得多聽幾遍。

We are busy preparing for the coming sports meet. 我們正為馬上到來的運動會忙著做準備。

3、作表語

動名詞作表語時句子主語常是表示無生命的事物的名詞或what引導的名詞性從句。表語動名詞與主語通常是對等的關系，表示主語的內容，主語、表語可互換位置。

Your task is cleaning the windows. 你的任務就是擦窗戶。(Cleaning the windows is your task.)

What I hate most is being laughed at. 我最痛恨的就是被別人嘲笑。 (Being laughed at is what I hate most.)

4、作定語

動名詞作定語往往表示被修飾詞的某種用途。如：

a walking stick ＝a stick for walking=a stick which is used for walking

a washing machine=a machine for washing=a machine which is used for washing

a reading room=a room for reading=a room which is used for reading

a measuring tape=a tape for measuring=a tape which is used for measuring

sleeping pills=pills for sleeping=pills which is used for sleeping

仔細看看就知道了的