有没有it is been+段时间+since和it was be+段时间+before这种表达?

有没有it is been+段时间+since和it was be+段时间+before这种表达? It is / has been + 段时间 + since + 一般过去时,从句中的动词用延续性动词和非延续性动词有何不同请详解并举例说明,谢谢 it has been said与 it is said使用上有没有什么差别 Si有没有-4价 有没有it was +时间 since ...大家一定知道有It is +时间 since .请问有没有 it was +时间 since.如果有,请问it was 后面加什么?since后面加什么? 有没有it was/had been + said that +从句这种结构若有的话那从句的时态用什么还是只有it is said that这种 这段时间有没有什么比较好看的电影 一道英语选择题01it ___quite correct that happinesscomes from thinking about things in a positive way.A has been turned out B is turned ou有没有it is turned out that这说法象it is said that 有没有is said to have been doing的结构 Si有没有简单离子,P呢? it is/has been= it is been very nice talking to you请问为什么有个been 有没有it is sure that Your room is si dirty.You must____ it clean. It is a pleasure!zhong wen yi si? It is been an honor serving with you.这句有没有语法错误 it is said that this book ---- translated into many languages,for it is famous.A.has been B.will be C.is being translated原因 C没有translated It is the first time I have ever been to China.It is the first time I have been to China.这两句怎么翻译?有什么不同?