请问这里为什么用“do we When we fail to listen,not only do we not receive the message,When we fail to listen,not only do we not receive the message,but we send the message that we are just plain dumb.

请问这里为什么用“do we When we fail to listen,not only do we not receive the message,When we fail to listen,not only do we not receive the message,but we send the message that we are just plain dumb. Do you know when he left?这里为什么用left when are we leaving为什么不是when do we leave do you agree to the plan?yes,we all are.请问这里答语为什么不用we do. When we were students,we would have lots of serious discussions.这里为什么用would have? Do you remember the day which we spent together 这里为什么用which能用when吗我个人认为we spent together 能构成完整句子就缺时间状语,那么为什么用which when i have done that ,i shall have done all i was supposed to do请问这里为什么用将来完成时 All we are planning to do is watch a couple of DVDs.请问为什么这里用watch 不用to watch 或是 is watching? It seems like years since we last met. 请问这里为什么用we而不是our? what does your family do?请问这里为什么要用does 这里没有单数第三人称啊 What do you want to be when you grow up?这里为什么要用to be? When was the telephone invented,do you konw?为什么这里用was不是were? when 回答 during请问 when do we plant trees?回答可以用during spring 吗? 正确答案是 in spring when do we when do we When we meet any ,we should face it bravely.这里的difficulty为什么不是用复数形式? 关于语法问题,Even though the child pretnded to be sleeping ,when we opened the bedroom door we were not fooled.请问,另,这里为什么用 TO BE SLEEPING呢, has read more books than i do请问这里为什么用现在完成时,还有i do在这里怎么解释?