Unit 3 Online travel
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，需加上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.
4. 如果是接雙賓語的動詞改為被動語態(tài)時，直接賓語(物)作主語，那么動詞后要用介詞，這個介詞是由與其搭配的動詞決定的。
he gave me a book. →a book was given to me by him.
he showed me a ticket. →a ticket was shown to me by him.
my father bought me a new bike. →a new bike was bought for me by my father.
5. 一些動詞短語用于被動語態(tài)時，動詞短語應當看作一個整體，而不能丟掉其中的介詞或副詞。
we can’t laugh him. →he can’t be laugh by us.
he listens to the radio every day. →the radio is listened to by him every day.
the nurse is taking care of the sick man. →the sick man is being taken care of by the nurse.