9月1日早上9:27--9:40

Jim hurt his arm playing tennis.

Feeling tired, I went to bed early.

同一主語(yǔ)的兩個(gè)行為同時(shí)發(fā)生，其中一個(gè)行為常可用-ing 形式來(lái)表示。這個(gè)短語(yǔ)一般放在主句的后面。

I've just seen Carol. She's in the bar having a drink.

A man ran out of the house shouting.

Do something! Don't just stand there doing nothing!

如果一個(gè)行為發(fā)生時(shí)，另一個(gè)行為正在進(jìn)行，另一方行為可以用-ing 短語(yǔ)來(lái)表示：

Jim hurt his arm playing tennis.

Did you cut yourself shaving?

?在while 或 when 后面也可以用-ing 結(jié)構(gòu)：

Jim hurt his arm while playing tennis.

Be careful when crossing the road.

如果一個(gè)行為發(fā)生在另一個(gè)行為之前，發(fā)生在先的行為用having (done) 表示：

Having found a hotel, we looked for somewhere to have dinner.

Having finished her work, she went home.

after 后也可用-ing 結(jié)構(gòu)：

After finishing her work, she went home.

如果一個(gè)短暫行為緊接著另一個(gè)短暫行為，第一個(gè)行為用-ing 的一般形式，而不用完成式：

Taking a key out of his pocket, he opened the door.

-ing 短語(yǔ)還可以用來(lái)解釋某事或說(shuō)明原因，這時(shí)它常放在句首:

Feeling tired, I went to bed early.

Being unemployed, he hasn't got much money.

Not having a car, she finds it difficult to get around.

Having already seen the film twice, I didn't want to go to the cinema.