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be to blame,be to

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be to blame,be to
(1)John,rather than his roommates,is to blame.
(2)I think mary,rather than Lucy,is to praise.
问:这两句话不是被动语态吗?为什么会用be to do?类似于这种形式的短语有哪些?
详阅:
【不定式】to blame,to let,to seek,to rent,to find用【做表语】时,通常用主动表被动意义.
例如:Who is to blame?该怪谁呢?
She was in no way to blame.决不应该责备她.
A better way is yet to seek..还得找一种更好的办法.
The taxi is to rent.汽车出租.
Much remains to find.有待探寻.
The house is to let.房子出让.