need, want, require后的非谓语动词

当这三个动词表示“需要”时，其后接不定式和动名词均可，且意思基本相同，只是所用语态不同：接动名词时要用主动式表示被动含义，而接不定式时则要用被动形式表示被动含义。如：

1. The machine wants repairing.

= The machine wants to be repaired.

这机器需要修理。

2. These sentences need explaining.

=These sentences need to be explained.

这些句子需要加以解释。

3. Lentils do not require soaking before cooking.

= Lentils do not require to be soaked before cooking.

小扁豆在烹饪前不必浸泡。