【问】 Why____?

A. you complain B. you are complaining

C. to complain D. complain(Nelson，300A)

我不知道选C (to complain)正确，还是选D(complain)正确。查了半天语法书和辞典也未查到答案。

【答】 这里应该牢记：why (not)只能跟不带to的不定式。why not do这个结构常常用来表示建议：

1. Why not try to train your character? (Mis)

为什么不努力去锻炼自己的性格呢?

2. Why not wait till the winter sales to buy a new coat? (LEG)

为什么不等到冬季大甩卖时再买一件新外衣呢?

这是各类考题经常考核的一个项目：

1. Why not to do it right now?

2. Why not to wait for a couple of days?

3. Why to worry about such trifles?

4. You are putting on weight. Why not____your milk without sugar?

A. have B. you have

C. having D. for you to have

5. Why____? It’s not very important.

A. to worry B. worry

C. you are worried D. you worry(Nelson，300C)