It has been a week since we arrived here.(语法点有哪些)

It is a week since he has been to BeiJing. it's been a good week.是什么时态? 短文改错it´s been a week It has been e()hot this week. It's has been accepted what a week this has been It has been a week since we arrived here.(语法点有哪些) it has been opened for no more than a week 这样说对吗 It has been snowing since a week ago.(改为一般疑问句) It ___for a week,and now it hasn't stopped yet.A、has rainedB、has been rainingC、rainedD、had been raining 谢谢拉请说明原因，谢谢 I have been here for just a week.(改为同义句) It has been just a week （） I （）here It has been e______ hot this week 填什么 It has been raining for nearly a week-_____.The weather forecast says it will be sunny this weekendA No problem B all right C don't worry D it's a pity --Where's your father?---He_____Beijing for a week.A.has gone off to B.has left forC.has been off to D.has set off for it's always been you(It has always been it has been可以缩写成it's been it's been.的全称是不是 it has been... It`s been such a long week.这个星期太漫长了. been在这里是什么成分