为何不写成This is the first time that I have been abroad for.后面为什么不加for?（不是for the first time吗？） 那你把它改为简单句不就成了I have been abroad the first time.这样不就少了for了吗

This is the first time when I go abroad,还是that I go abroad?I've been abroad for the first time.里有个for，那为何不写成This is the first time that I have been abroad for. this is the place where chairman mao once lived.此句中live为不及物动词,为何不加in? This is a ture story.Recently,one of my best friends,whom I 've_happiness and sorrow with - the fir 为何不写成This is the first time that I have been abroad for.后面为什么不加for?（不是for the first time吗？） 那你把它改为简单句不就成了I have been abroad the first time.这样不就少了for了吗 醛基-CHO为何不写成CHO-呢? Is this school____we visited last year?A.where B.the one where C.the one D.which我想知道为何不选 whereIs this the school____we visited last year 要是这样改可以填where this is one of the explanations ____people hang stockings in front of the fireplace for fatherchristmas to put presents in.A why B for which C for why D that 为何不选A呢,怎么理解,求教 The first thing you need to do is write the homework Is 后为何不加 to? The present population of this city is three times（ ）it was ten years ago.The present population of this city is three times（ ）it was ten years ago.A.what B.since C.that D.as 正确答案是A,为何不选C? This is the book which you wanted 定语从句This is the book which you wanted .这个句子可以写成This is the book that you wanted .是不是还可以这样写呢?This is the book you wanted . why is Tim finding this trip exciting?可写成why do the Tim finding this trip exciting吗　为什么 Jim is so glad becouse the manger tells him that he will get a promotion next weedthe manger tells him 为何不写成told him.因为这是过去发生的事manager，我写错了。书上就用这时态，不知对否 在答语中,it和 the one的区别--Is this the computeer you____ last week?--That's _________.A.had it repaired;the one B.repaired it; itC.had repaired;itD.had repaired; the one.此题选 C 为何不选D. there is a knock at the door.it is the second time that someone _____ me this evening.A had interrupted B would have interruptedC interrupts D has interrupt用完成时我知道.但我觉得主句不用过去时为何不选D? wear sneakers in gym class.为何不写成gymnastic class呢? The Spring Festival is the most important traditional one in China.As an important part of it,fir what is this?可以写成 what's this?为什么? this the only thing(A.that B.which C.what D.how) you most do well 选哪个理由理由！！！！！为何不选B