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在with a lot of problems to settle 中为什么to settle不用to be settl

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在with a lot of problems to settle 中为什么to settle不用to be settled?
有短语settle the problem.故有此问.请高手指教,
雨田摆渡:在There are many things to do中由于是there be 句型故主动被动均可。并不是特殊用法。
楼主好以下我帮你整理了一下不定式的主动形式表示被动
2.在"n/pron + be + adj + to do"结构中.常用的形容词有easy,difficult,hard,impossible,nice,pleasant,light,heavy,interesting,important,expensive,cheap,fit,dangerous等.
例如:
He is hard to convince.
He is an impossible person to work with.
3.在"too—to do; enough…to…"结构中.如:
The problem is too difficult to work out (to be worked out).
The house is big enough to live in.
4.在"with+n+to do"结构中.
例如:
With nothing to do,he lay in bed.
With so many exercises to do,I can't go to the cinema.
5.当不定式的逻辑主语在句中出现时.
例如:
I have a letter to type today.
(I是to type的逻辑主语)
Do you have anything to say
(you是to say的逻辑主语)
6.当不定式隐含在for sb to do结构中
时.
例如:
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.
7.一些作表语用的不定式的主动形式.
常见的这类动词有let(出租),rent,
hire,blame等.
例如:
The house is to let.
I felt l was to blame.
看完之后你就明白了