1.肯定句：主语+was/were+v-ing形式+其他成分。

We were playing the piano at eight last night.

昨晚8点钟我们正在弹钢琴。

2. 否定句：主语+wasn't/weren't+v-ing形式+其他成分。

We weren't playing the piano at eight last night.

昨晚八点我们没有在弹钢琴。

3. 一般疑问句：Was/were+主语+v-ing形式+其他成分?

Were you playing the piano at eight last night?

你们昨晚8点钟在弹钢琴吗?

一般疑问句的回答

肯定回答：Yes,主语+was/were.

否定回答：No,主语+was't/weren't.

4.特殊疑问句：特殊疑问词+was/were+主语+v-ing形式+其它?

What was he doing at this time yesterday?

昨天这个时候他在干什么?

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