分类：教育/科学-学习帮助
问题：问一个句型转换Whatwecannotgetseemsbette 
What we can not get se better than what we already have为什么不能转换为It seems better than what we have what we can not get
回答：其实看看就觉得不怎么舒服了。事实上，有这样一条规则：当主语从句是由what引导的，而且谓语动词是连系动词尤其是be动词时，不能用it作形式主语，并且将主语从句后置。e.g.: What you said was/seemed/appeared true.(correct)       It was/seemed/appeared true what you said.(wrong)通过以下一题也可说明此规则的正确。It is your ability ______ matters. A) what  B) that答案为B，此题是一个强调句。如果无上述的语法规则，那么A也无错误之处了。另外，还有：当主语和表语同为动词不定式、动名词或名词性从句时，不能用it作形式主语，并且将词不定式、动名词或名词性从句后置。e.g.: To live is to struggle.(correct)       It is to struggle to live./It is to live to struggle.(wrong)      Seeing is believing.(correct)       It is believing seeing./It is seeing believing.(wrong)