選修7第2單元Unit 2 不定式的被動語態導學單（3）
常用的形容詞有easy，difficult，hard，impossible，nice，pleasant，light，heavy，interesting，important，expensive，cheap，fit，dangerous等。he is hard to believe in.the house is comfortable to live in.3.在“too—to do; enough…to…”結構中，常用不定式的主動形式表達被動意義。the problem is too difficult to work out.the house is big enough to live in.4.在“疑問代詞+to do”結構中，常用不定式的主動形式表示被動含義。i don’t know what to do next. she will tell you which bus to take.do you know who to go with?4.在“with+n+to do”結構中。with nothing to do，he lay in bed.with so many exercises to do，i can‘t go to the cinema.5.動詞不定式的邏輯主語在句子中出現i have a letter to type today.(i是to type的邏輯主語)do you have anything to say? (you是to say的邏輯主語)注意比較：1) do you have anything to send?2) do you have anything to be sent? （1）你有什么東西要寄嗎?(不定式to send的動作執行者是you) （2）你有什么要(我或別人)寄的東西嗎?(不定式to be sent的動作執行者是已被省略的me或someone else)注意：若句子的主語并非不定式的邏輯主語時，不定式則必須用被動式6.當不定式隱含在for sb to do結構中時。this is the best book to read (=for us/you to read).
the important thing to do is to lock the door when we leave the house.7.一些作表語用的不定式的主動形式。常見的這類動詞有let(出租)，rent，hire，blame, to seek等。the house is to let.
i felt i was to blame.the reason is not far to seek. 理由不難找到。8. need /require/want 表示“需要”時+ to be done, 和接v.-ing的主動形式表達含義一致。 我的車需要修理。my car needs repairing(=needs to be repaired). 9.通常在believe, suppose, say, report等動詞構成的句子中可以進行主動語態到被動語態以及被動語態和動詞不定式的轉換.如：they say that mike is sick in bed.=it is said that mike is sick in bed.=mike is said to be sick in bed.據說麥克臥床不起.exercise:1. having a trip abroad is certainly good for the old couple, but it remains____ whether they will enjoy it. a. to see b. to be seen c. seeing d. seen2. i hurried to the meeting hall, only____ that the meeting had been put off. a. to tell b. to be told c. telling d. told3. do let your mother know all the truth, she appears____ everything.