They are swimming at the beach这句话对吗不是说两个动词不能在一起吗?

and they are very good at swimming in the The boys are good at swimming .They are good ______(swim) Are you good at swimming? you,at,are,good,swimming look!they are swimming at the pool.这里为什么不用go swimming?不是说过go+ving表示一种状态吗? Are they good at ()?-yes,they are.A.swim B.to swim C.swimming D.the swim 嘻嘻…… 针对They are (at the swimming pool)句中括号部分怎样提问? They are swimming at the beach这句话对吗不是说两个动词不能在一起吗? are they swimming or running 回答 They (swim;are swimming)in the river They are swimming.(改为一般疑问句) They are swimming.改为否定句 we are good at swimming.同we( ) ( ) ( )swimming They were swimming at that time.（改为否定句） They _____ swimming at that time. Some of______(we)are good at swimming They are swimming in the river 还是（they are go swimming in the river) They and I are swimming还是is swimming或am swimming Are they swimming?(做否定回答）_____,they ______.