what game are the children playing now?中的谓语动词为什么用are,主语是什么?

-What do you think of the game the children are playing now? The children are playing happily.什么是主语?什么是谓语? The children are playing football now. 1011412:when the children are secretly playing the game,pare The children are playing games. The children are playing happily. What are you doing?-Playing computer game 孩子们正在打篮球 the children are playing basketball.为什么用 playing The boys who are playing football are from Class One ,主语,谓语, Look,the children ______(are,can)playing a game.填哪个 The children are playing game ___ hide-and-seek.怎么填 furniture作主语时,谓语动词用is还是are?