there are their friends 为什么用their不用they

Their shirt are there 对Their提问 There are their shirts[复数] There are their shirts[同义] C语言问题,提供思路就行（当然有伪代码甚至完整代码就更好了）In every summer there are students graduating from school.A lot of graduating students would like to host their parties to say good-bye to their classmates and frie there are their dlouses的同义句 there are their bulouses的同义句 there cases are their friends用their friends 提问 there are their friends 为什么用their不用they There are ----(many)students in their class than in our. There are some books in their bags 改为同义句 There are some trees (n )to their house. There are both in their early 20s. 连词成句 both ,parents ,over ,their ,are ,there they are going to spend their h()there The children feel their parents are there for them. it means people give presents to each other to make their relatives and frie There are some books in their bags.------ ------ some books in their bags.改为同义句 There are their names.对画线部分提问their是画线部分