in four months' 后面不加time

in four months' 后面不加time we have been in grade nine＿about four months. He has been there for six months.has been后面为什么不加to?还有为什么要加for呢? 为什么in the last few months 中 few前面不加a 英语翻译This race,which went on for exactly four months,was the last of its kind.不加逗号的话怎么翻译 several months后面加单数谓语还是复数谓语 Four months ago today,four months later today意思是什么 in the past two months后面为什么用现在完成时? 听力、It is four months since Mr Black moved to Beijing.选相近的.A. Mr Black moved to Beijing four months ago.B. Mr Black has lived in Beijing for four months.答案是B.A为何不行. 与“It is four months since Mr Black moved to Beijing.”意思最相近的句子A.Mr Black has lived in Beijing for four months.B.Mr Black moved to Beijing four months ago. in months' After four months in foreign parts.这里的parts 怎么翻译啊. Please come here in four months if you need any change.的意思 The movie was made in eight months over a four-year period翻译 the Olympic Games are held once ___A every four years B .every four year C.every -four -year怎样区分呢?为什么B 不可以呢？Every week 后面也不加s啊？ 英语翻译live后面是否要加in?什么时候不加in? move后面要加in还是加into还是不加. 为什么Where did you live?的后面不加in,而What house did you live 后面要加in?