There’re some children （ ）play on the ground.填playing还是play

There’re some children （ ）play on the ground.填playing还是play on the play ground 还是 in the play ground There are some children who _____(play) football on the play There are some stcdents on the play ground.转换为一般疑问句 'The child is playing on the play ground.(的复数形式是） on the play ground 中文 I see the children _________cards.这里填to play 还是playing.为什么? There are two _______ students on the play ground There are students on the play ground.改错 I found many children playing sports on the playground."play I see some boys( )(play)on the play ground all the time I`d like是填playing还是to play,the piano and singing some songs帮