“疑问词+不定式”的若干个易错点

易错三：与动词know连用要注意什么

当要表示知道如何做某事，know之后不能直接跟动词不定式作宾语，此时可改用know how to结构。如：

我会做西班牙式的摊鸡蛋。

误：I know to make Spanish omelettes.

正：I know how to make Spanish omelettes.

易错四：与某些只接动名词作宾语的动词连用

有些动词可以接“疑问词+不定式”作宾语，但通常不直接跟不定式作宾语。这类动词主要有consider (考虑), discover (发现), discuss (讨论), explain (说明), find (out) (查到), know (知道), observe (观察), suggest (提议), wonder (怀疑), understand (了解)等。如：

Have you considered how to get there? 你是否考虑过如何到那儿去?

Our teacher explained how to use the machine. 老师向我们说明如何使用这台机器。

We discussed what to do and where we should go. 我们讨论了该怎么办及到哪里去。

你能说明一下蛋糕的做法吗?

误：Can you explain to make a cake?

正：Can you explain how to make a cake

易错五：which to do 的两种用法

要注意“which+不定式”结构，其中的which有时是疑问词。如：

I can’t decide which to choose. 我不能决定选哪个好。

Did you ask her which to buy? 你问没问她该买哪一个?

有时可能是关系代词，相当于一个省略的定语从句，此时主要用于介词后作宾语。如：

She must have time in which to grow calm. 她必须有冷静下来的时间。

Allow me one minute in which to change my costumes. 给我一点时间来卸装。

这两句中的which to…也可改为定语从句(www.hxen.net)：

She must have time in which she can grow calm.

Allow me one minute in which I can change my costumes.