this kind of books sells well and are sold out in the bookshop这句话中第一个sell为什么用主动sells.第二个sell为什么用被动are sold还有,我记得 this kind of+名词复数,谓语动词用单数的,为什么第二个sell要用are

books of this kind The books of this kind sell well.那么This kind of books sells well. Its said that this kind of books _____(sell out). Its said that this kind of books ___.A .has been sold out B.is sold well Its said that this kind of books ___.用现在完成时的被动语态还是用过去式的被 it is hard to understand this kind of Books 去掉形式主语后,下列哪一种是对的?改形式主语有什么要求Books of this kind is hard to understandTo understand this kind of Books is hard 用动词的适当形式填空 ① Books of this kind ____ (sell) well in the bookstore.② This kind of books I like books,but I don't like __book of this kind.A :a B :the I don't think this kind of books is suitble ___children to read.加油 This kind of books ________well.A doesn't sell B,aren't sold该选哪个 This kind of books are popular with all the students 这句话中哪里错了? 麻烦讲清楚语法,Books of this kind ______________ (sell) well. He enjoys ( ) (read) this kind of books单词的适当形式填空 Li hui likes chilldren's stories better than any other kind of books保持原意Li hui ______ children's stories ______ any other kind of books This kind of book c___ ￥20.It's expensive this kind of sth sth要加s吗 it's kind of和it was kind of 有什么不同如it's kind of you to do thisit was kind of you to do this 带有of的短语 谓语是跟of前的还是of后的比如this kind of books is/are?books of this kind is/are?two-thirds of the earth surface is/are?请说明理由