1. Let sb. do sth. 让某人做......
举例:
Let'sgoswimming. 让我们去游泳吧。
Let themcleanthe classroom. 让他们打扫教室。
Let Tomwashhis clothes by himself. 让Tom自己洗衣服。
注意:
Let's=Let us
Let sb. do sth. 属于祈使句里重要句型之一。
根据动宾结构，let后加人称代词时，要用宾格。
2. Why not do sth.? =Why don't you/we do sth.?为什么不做某事？
举例:
Why notgoswimming? 为什么不去游泳呢？
Why don’t youhavea rest? 你为什么不休息一下呢？
注意:
Why not 直接加动词原形，没有人称主语。
加入助动词否定式don’t，不要漏了人称主语，常用you /we。
3. Shall I/we do sth.?我们可以做......？
举例:
Shall Iopenthe door? 我可以开门吗？
Shall wehavesupper with you? 我们可以和你吃晚饭吗？
注意:
shall表示建议或请求语气的程度，较委婉，不要翻译为应该。
shall常用第一人称I/we。
4. You had better do sth. = You'd better do sth. 你最好做......
举例:
Tom had betterhavea rest. Tom最好去休息一下。
You’d betternot sleep. 你最好不要睡觉。
注意：
You had=You’d, had better没有人称、时态、数的变化。
had better do sth. 否定是had betternot dosth. 最好不要做某事。
5. would like to do sth.= want to do sth. 想要做某事
举例:
What would you liketo drink? = What do you want to drink? 你想要喝什么？
Tom would liketo bea teacher. =Tom wants to be a teacher. Tom想要成为一名老师。
注意：
would like没有人称、数、时态的变化。
would like to do的否定形式是would not like to do=wouldn’t like to do。
Would...like to ...? 常用回答:
肯定回答Yes, I would loveto./Yes, I would liketo. 其中I would = I’d。
否定回答No, thanks.
6. It's a good idea to do sth. 做某事是个好主意。
举例:
It’s a good idea to go swimming. 游泳是个好主意。
It’s a good idea to have a rest. 休息一下很不错。
注意:
It在句型It's a good idea to do sth.中作形式主语，真正的主语是to do sth.
实际写作中还可以把a good idea替换为形容词，变成加分句型It’s+adj.+to do sth.
7. What about doing sth.? = How about doing sth.? 做某事怎么样？
举例:
What about swimming? 游泳怎么样？
How about drinking juice? 喝果汁怎么样？
注意:
What about you?可以表达为And you？
有时候句型记多了，容易忘记What about/How about后边加动词ing。这里建议可以结合技巧“介词后加动词ing(这一技巧在考试中能发挥极大作用)”，about为介词，后接动词ing。
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