特殊疑问句 What was he saying yesterday?他昨天说什么? 一般疑问句 Were they doing their homework at that moment?他们在那时做作业了吗? 肯定句 I was finishing my homework at night.我昨天晚上写完我作业了, 否定句 She wasn't watching TV at that time. 她在那时没有看电视.
特殊疑问句 What were they doing at that moment? 一般疑问句 Were you watching TV the whole morning? 否定句 He wasn’t having supper last night. 肯定句 She was writing a novel last night.