为什么要用完成时it's the first time that i have written to a foreign friend.

为什么要用完成时it's the first time that i have written to a foreign friend. its the first time that sb have done sth为什么从句用完成时 it is the first time that后为什么用完成时 I'm sorry you've missed the train ,It __ five minues ago.为什么填left?我觉得要用完成时更好 It the first time I have got up earlier than my parents.这里的从句为什么用完成时? 初中英语为什么这里要用完成时 这个为什么要用完成时? It is time that 为什么用过去式啊?It is the first time .为什么用完成时?我总记不住 想知道原 Remember to put back the book,when you have finished it,从句为什么用完成时态 it is the first time that I -have come to BeiJin为什么要用完成时啊,后面 这句话 改为被动 为什么后面的动作 要用完成时 一般都什么时候用完成时?原句：it is thought that the prisoner escaped by climbing over the wall.改为：the prisoner is thought to have escaped by climbing over the wall如 die的用法It's three years since his mother died.为什么不能用has died什么时候die又用完成时? 初中英语3 5为什么这里要用完成时?什么时候用完成时? Have you bought any tomatoes?Yes ,I-----it in the market.用完成时回答have bought ,还是过去式?是过去式bought呢为什么? It(This) is/was the first(second,third……) time that sb.have/had done sth.从句中的时态为什么必须用完成时? Don't get off the bus until it has stopped.为什么until后面用完成时 不是主将从现吗 I want to see you again ,just I do not know what to say .Before we say goodbye,it's like the fir It's ____ (get) late.Let's go home.答案是用进行时getting,用完成时got行吗?