Isawhimcomedownstairs.我看见他下了楼 。（说明他下楼了这件事）
Isawhimcomingdownstairs.我看见他在下楼 。（说明他下楼时的情景）
九、使役动词let, make, have后面直接跟动词原形; help后面的动词不定式作宾语补足语, to可有可无
She let us meet her at the station, but she didn’t come.她让我们去车站迎接她,卡她没有来.
十、区别下列词组的不同含义:
remember to do 记住要做某事
remember doing 记得曾经做过某事
forget to do忘记要做某事
forget doing 忘记曾经做过某事
stop to do 停下来去做某事
stop doing 停止做某事
go on to do 继续做另一件事
go on doing 继续做原来在做的事
十一、It takes sb some time to do sth.花费某人一段时间干某事.
It took me half an hour to do my homework yesterday.昨天我花了半小时做回家作业.
It took Jim an hour and a half to read the book.吉姆花了一个半小时看这本书.
It took mother one and a half hours to do the housework.母亲花了一个半小时干家务.
用汉字表述上面的句型为:It + take +人+一段时间+ to do sth.
一段时间形式往往为像这样的例子:
fifteen minutes15分钟,an hour一个小时, two days两天, half a month半个月,a year and a half一年半…等等
十二、不定式的特殊句型Why not
"Why not +动词原形"表达向某人提出建议，翻译为："为什么不……?" "干吗不……?"
例如：　Why not take a holiday?干吗不去度假?
练习
根据括号内的动词,用适当的形式填空,空内可能不只填一个词,使句子完整意思正确
1. They usually __________ kites on Sundays. (fly)
2. Look! The dogs __________ after the cat. (run)
3. Miss Gao __________ English in our school since she came here. (teach)
4. The class meeting _________ last Wednesday afternoon. (hold)
5. You should let him __________ the work by himself. (finish)
6. Meimei __________ to wash the old woman’s clothes twice every week. (go)
7. Mr Jiang __________ us Chinese last term. (teach)
8. My father __________ back from Japan tomorrow. (come)
9. It’s seven o’clock now. The Greens __________ breakfast together. (have)
10. Jim __________ many Chinese songs since he came to China. (learn)
11. Please remember __________ the window when you leave the room. (close)
12. After school some students began to do some __________ in the classroom. (clean)
13. English __________ widely in the whole world today. (speak)

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