第1个回答 2014-02-27
否定句:They aren't playing basketball. 一般疑问句:Are they playing basketball? 回答:Yes,they are.
第2个回答 2014-02-27
They playing baskteball
They do not play baskteball
Do they play baskteball?
yes they do
no they do not
第3个回答 2014-02-27
Are they playing basketball? Yes,they are. No,they aren't.
第4个回答 2014-02-27
They are playing basketball,
They aren~t playing basketball,