a series of ,后面加什么词

a series of ,后面加什么词 a series of books 后面加is 还是 are?a set of 呢? a series of 名词复数 那后面加谓语用单数还是复数?为什么啊A series of football games (is)hold ....VS.A series of discussion groups have been.... A series of 加复数名词 谓语动词用什么数啊 a series of a series of books后面为什么接is a number of books 后面为什么接are, be a friend of 后面加什么 be a friend of 后面加什么 a series of seven books说法正确吗?a series of 表示一系列,后面还能加数量词seven吗? a series of 和a pair of 后面谓语动词用单数还是复数? 是a series of factors还是a series of reasons 主语为a series of+复数名词 ,谓语应该用什么 主语为series of +复数名词 谓语应为什么 a lot后面加什么词?那a lot of呢?这两者又什么区别? a little bit和a bit of的区别a littlebit后面加什么?a bit of 后面加什么? a series of a serious of 区别 the last of a series of competitions A SET OF 同 A SERIES OF 有什么区别啊? 有关a bit ofa bit of后面加什么词时没有of是a.和分词么?