難點三：與動詞know連用要注意什么

當要表示知道如何做某事，know之后不能直接跟動詞不定式作賓語，此時可改用know how to結構。如：

我會做西班牙式的攤雞蛋。

誤：I know to make Spanish omelettes.

正：I know how to make Spanish omelettes.

難點四：與某些只接動名詞作賓語的動詞連用

有些動詞可以接“疑問詞+不定式”作賓語，但通常不直接跟不定式作賓語。這類動詞主要有consider (考慮), discover (發現), discuss (討論), explain (說明), find (out) (查到), know (知道), observe (觀察), suggest (提議), wonder (懷疑), understand (了解)等。如：

Have you considered how to get there? 你是否考慮過如何到那兒去?

Our teacher explained how to use the machine. 老師向我們說明如何使用這臺機器。

We discussed what to do and where we should go. 我們討論了該怎么辦及到哪里去。

你能說明一下蛋糕的做法嗎?

誤：Can you explain to make a cake?

正：Can you explain how to make a cake

難點五：which to do的兩種用法

要注意“which+不定式”結構，其中的which有時是疑問詞。如：

I can’t decide which to choose. 我不能決定選哪個好。

Did you ask her which to buy? 你問沒問她該買哪一個?

有時可能是關系代詞，相當于一個省略的定語從句，此時主要用于介詞后作賓語。如：

She must have time in which to grow calm. 她必須有冷靜下來的時間。

Allow me one minute in which to change my costumes. 給我一點時間來卸裝。

這兩句中的which to…也可改為定語從句：

She must have time in which she can grow calm.

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

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