2018年普通專升本英語語法：情態(tài)動詞的被動語態(tài)

含有情態(tài)動詞的謂語變成被動語態(tài)時，結(jié)構(gòu)為：

一般式：情態(tài)動詞（can,could,may,might,must,should,need等）+be+過去分詞

完成式：情態(tài)動詞（can,could,may,might,must,should,need等）+have+been+過去分詞

例句：

Lost health may be replaced by temperance or medicine.

失去的健康可以靠節(jié)制或藥物而復得。

This can be done by hand.

這可以手工做。

This mustn't be neglected.

這一點不可忽視。

It needn't be mentioned in your talk.

這一點你在談話中不必提及。

The environment should be improved.

環(huán)境應(yīng)當改善。

The project might have been completed earlier.

這項工程本可以早點完工的。

Such a situation could have been changed.

這種情況本可以改變的。

They shouldn't have been told about the plan.

這個計劃是不應(yīng)當告訴他們的。