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4．在使役動詞makr及感官動詞see ，hear….等動詞的被動語態(tài)形式后面出現(xiàn)的作主語補(bǔ)足語的不定式須加不定式符號“to•
The teacher made Tom answer it again.（主動語態(tài)，不加“to )
Tom was made to answer it again.（被動語態(tài)，加“to )
5.短語動詞的被動語態(tài)要注意不可丟失其附加的介詞、副詞或短語。
look at，laugh at，send for，call on，carry out， listen to，take care of ,make use of,depend on，pay attention to，hand in，put on，look up，give up〕等.
6. be＋過去分詞可以是被動語態(tài)形式，也可以是系表結(jié)構(gòu)形式。區(qū)別是，系表結(jié)構(gòu)表示主語狀態(tài)或特征，不帶by短語；而被動語態(tài)是表示主語的一個被動動作，可以帶by短語。
The job was well done.（系表結(jié)構(gòu)）
The job was well done by a skilled worker.（被動語態(tài)）
The composition is well written.（系表結(jié)構(gòu)）
The composition is written with great care;.（被動語態(tài)）
7．原來主動語態(tài)中的賓語如果是從句，變?yōu)楸粍诱Z態(tài)時，要用形式主語it.
It has been known to him that many friends will come to see him.
It is said that this book has been translated into several languages.
8．有一些動詞不能用被動語態(tài)。
break out，take place，happen，belong to，cost，suit，fit，have，let, wear, weigh. suffer, pass, kill the time, enter, last, meet（遇見），join（參加），fail等
9．賓語為反身代詞時，不用被動語態(tài)，只用主動語態(tài)形式。
The man introduced himself as Mr. Wang.
10．有些動詞或情態(tài)動詞常用所接的不定式來表示被動意義。
如：happen，pretend，seem，used to，ought to，appear等。
The house used to be painted white.
The job has to be done before dark.
On the way we happened to be caught in the rain.
11．有些動名詞在want, need, require和介詞worth后形式為主動，意義為被動。
12．有些動詞用主動形式來表示被動意義。如：clean, sell,look，lock，open，write，read，wash,feel等。
This kind of cloth washes easily.
These books sell well.（好賣）
