it is 为什么不能用that 或this is 替代在比如说 it is easy for me to do the work.

为什么不能用it is sure that,而可以it is certain that it is 为什么不能用that 或this is 替代在比如说 it is easy for me to do the work. the question is（ that if ）it is worth doing that if 为什么不能用在这里,只能用whether Thw knife___we cut the bread is very sharp.为什么不能用that或which? who is that?it must be Mary.为什么不能用she? It is/was not until...that从句,为什么从句不能用when引导 The room is so dirty that it wants (cleaning )为什么不能用being cleaned it's uncertain ______ the experiment is worth doing为什么不能用that What is this?和What is that?的回答是不是回答用It?为什么不能用this和that呢? The weather in chongqing is hotter than that in beijing .为什么要用that为什么不能用it 关于英语中形式宾语it的问题I found （）important for us to learn English.（）内为什么要用it或it is而不能用that? The weather in Beijing is colder than that in Hawaii.这句话中的that能不能用it代替,为什么? it is a fact that English is accepted as an international language句首为什么不能用there 引导there 作主语什么时候能用 it和that的用法区别The cost is half as much as____used to be two years ago.为什么用it而不能用that? That does not sound good为什么不能用is not 62.is the power of TV that it can make a person suddenly famous.（辽宁）A:Such B:This C:That D:So为什么不能用that it occurred to sb that为什么不能用it happened to sb that It is all round the world为什么不能用around