分析这个英语句子的时态和句意!it is／was 3 years since he came here.since不一定和完成时连用吗?用is或was有什么区别 为什么since不能用做that?

分析这个英语句子的时态和句意!it is／was 3 years since he came here.since不一定和完成时连用吗?用is或was有什么区别 为什么since不能用做that? 分析英语句子时态,谢谢!it was becoming supposed to be impossible.此句的时态,为什么become要加ing? suppose加d? 帮我分析下这个句子的时态If you move to these area,it is conveninet for you to go to work.(凭印象写的,但是我确定时态和原句一样,特别不理解主句为什么不用一般将来时)sorry ,是 this area She is still doing it.这个句子时态对吗 用英语写这个句子的同意句：It is twenty minutes' walk from here 强调句,用It was, It is 怎么选择?强调句,用It was, It is 怎么选择? 是根据 主句的时态么? It was three years ago that I travelled last time. 这个句子应该是强调句吧? 强调句的话,It is / It was , 用 is ,或是 w 帮忙找英语句子语法时态错误,It is must be fun that we enjoy the beautiful view强调句,动词时态好像有问题, You have a dream,you got to protect it.句子成分如果把这个句子完整的说应该怎么说 然后分析这个句子的时态~:) while引导的句子和when引导的句子主从句的 时态,怎么判断的,怎么知道句子是这个时态的 英语句子的时态 帮忙分析一下这个句子的语法结构吧that is all there is to it it is being shown now. 这句这么理解?从时态语态来分析 请英语达人帮我分析一下这个句子结构Weather she will come or not is unknown 这句是什么从句?是怎样分析出来的呢? 英语这个句子怎么这么奇怪啊,分析下The polluted air made Mr.Guzman feel as if he were smothering.说下这个句子的时态,以及为什么这样造?以及as 和 made , There is a time when 和it is the first time后的句子是用什么时态? 关于英语强调句（新概念3册21课）It is...that..老师给的语法是It is/was...that ...没听懂 形式主语的be动词的时态与原来的句子时态是什么关系,It was怎么变? it is necessary that the meeting begin at once.翻译并说明begin这个时态怎么看,总句的时态怎么看谢谢 英语的倒装句,每个时态造两个句子,英语的倒装句,每个时态造两个句子,