Question

5．在两星期内完成工作是不可能的．It's impossible to finish the work in two weeks．

Answer 1

分析 It's impossible to finish the work in two weeks．

解答 答案：It's impossible to finish the work in two weeks．结合句意我们用it作为形式主语，动词不定式作为真正主语来表达，构成It is+adj+to do sth，不可能的impossible，完成工作finish the work，在两星期内in two weeks．故答案是It's impossible to finish the work in two weeks．

点评 当不定式、动名词、从句等用作主语时，避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾：
Is it necessary to tell his father everything？有必要把这一切都告诉他父亲吗？
It's no good sitting up too late．熬夜没有好处．
It is quite clear that he has read the book．很显然，他读过这本书．
It doesn't matter what he says．他说什么没关系．