情態(tài)動(dòng)詞的被動(dòng)語態(tài)

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

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

完成式：情態(tài)動(dòng)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(fù)得。

This can be done by hand.

這可以手工做。

This mustn't be neglected.

這一點(diǎn)不可忽視。

It needn't be mentioned in your talk.

這一點(diǎn)你在談話中不必提及。

The environment should be improved.

環(huán)境應(yīng)當(dāng)改善。

The project might have been completed earlier.

這項(xiàng)工程本可以早點(diǎn)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(gè)計(jì)劃是不應(yīng)當(dāng)告訴他們的。