9月1日早上9:27--9:40
Jim hurt his arm playing tennis.
Feeling tired, I went to bed early.
同一主語的兩個行為同時發(fā)生，其中一個行為?？捎?ing 形式來表示。這個短語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!
如果一個行為發(fā)生時，另一個行為正在進行，另一方行為可以用-ing 短語來表示：
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.
如果一個行為發(fā)生在另一個行為之前，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.
如果一個短暫行為緊接著另一個短暫行為，第一個行為用-ing 的一般形式，而不用完成式：
Taking a key out of his pocket, he opened the door.
-ing 短語還可以用來解釋某事或說明原因，這時它常放在句首:
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.
