there are their friends 为什么用their不用they

there are their friends 为什么用their不用they They are angry . their friends. there cases are their friends They are very happy______(see)their old friends.为什么 they are proud of their player.为什么不用players They are all their friends的意思? they are going to see their friends there 这句话有没有什么毛病 they ____ (welcome) by their friends when they arrived there They love their work中为什么用their,而不用them they are meeting their friends at lunchtime是什么意思,里面为什么要加thei They ( ) their good friends to their homes They can lay with their friends there.英译汉