使用被動語態(tài)應注意：

　　1、不及物動詞無被動語態(tài)。

　　What will happen in 100 years.

　　The dinosaurs disappeared about 65 million years ago.

　　2、有些動詞用主動形式表示被動意義。

　　This pen writes well.

　　This new book sells well.

　　3、感官動詞或使役動詞使用省略to的動詞不定式，主動語態(tài)中不帶to ，但變?yōu)楸粍诱Z態(tài)時，須加上to 。

　　例：make somebody do something→somebody+ be +made to do something

　　see somebody do something→somebody +be +seen to do something

　　A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.

　　The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.