关于被动语态的问题

题目

关于被动语态的问题
1.The ancient Egyptians are supposed to have sent rockets to the moon a long time ago.
为什么要用have?
2.Everything taken into consideration,the plan Xiao Wang put forward seems to be more workable.
前半句中的taken是做什么成分?为什么不用be动词?
为什么第一题的be动词不是用过去时？

答案

1.be supposed to do sth表示应该去做什么,但是如果表示“过去应该做某事”则要在不定式后边用have done sth. 这里是陈述一个过去的情况,所以用be supposed to have done sth.2. "everything taken into considerati...