they do not doing their homework为什么不对呀?

they do not doing their homework为什么不对呀? they-----[do/doing]their homework 选do还是选doing they (not do )their homework on Sunday They are doing their homework carefully.you'd better not---- They are not ( ) while they do their homework. they ( )(not do)their homework yesterday适当形式填空 They ____(not do) their homework at home every day. while they can not do their homework,they copy from their sc They are doing their homework?对doing their They have been doing their homework they don't doing their homework now. they do their homework every day=they ( ) ( ) their homework