题目内容：

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?

优质解答

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...