play .playing are play are playin 不同点有哪些?

I have many hobbies.They are (playing/play) football,(playin They are (play/playing)football next week. What are they doing?They_____(are playing,play) chess. we are told_____computer games on sundays a.to play b.playin There are only a______number of students playing on the play You are( ) with dolls?A.play B.playing you ____(play,are playing) basketball,I think. There are many studens play /playing games on playground. There are 40 students playing on the school play ground_____ look!the boys_(play)over there.为什么是is playing而不是are playing. 像play、playing这类的英语有哪些? Many student are play football and play basketball.They are