过去进行时结构

肯定句=主语(I/you/he/she/It/they/we)+was/were+doing+其它
否定句=主语(I/you/he/she/It/they/we)+was/were+not+doing+其它
一般疑问句及答语=Was/Were+主语(You/he/she/they/we)+doing+其它
答语：Yes,I was./No,I wasn't.
特殊疑问句=特殊疑问词+was/were+主语(I/you/he/she/they/we)+doing+其它