They are cheap.这句话对吗?

They are cheap.这句话对吗? 急问,do you think they are cheap对吗? they are alomst children这句话对吗? How many are they?这句话对吗? Are they calendars?这句话对吗? They are both tall man.这句话对吗 They are listening to radio这句话对吗? they are on a vacation ,这句话对吗 They think it that the school uniform is not only cheap but also formal for them 什么是形式宾语,什么情况用 这句话对吗? they are nurse 这对吗 they are always study it when they had born . 这句话对吗? The sweaters are_sale.They are very cheap. 合并：“We have sweaters.”“They are cheap. 合并：“We have sweaters.”“They are cheap.” Although ipad2 and iphone4 are very good,but they are too expensive这句话对吗,加But对吗 She'have.这句话对吗?they'have.这句话对吗? Are they preparing for the English evening last night?这句话对吗 They are many apples in the basket.这句话对吗,如果不对请改正