1.肯定句：主語+was/were+v-ing形式+其他成分。

We were playing the piano at eight last night.

昨晚8點(diǎn)鐘我們正在彈鋼琴。

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

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

昨晚八點(diǎn)我們沒有在彈鋼琴。

3. 一般疑問句：Was/were+主語+v-ing形式+其他成分?

Were you playing the piano at eight last night?

你們昨晚8點(diǎn)鐘在彈鋼琴嗎?

一般疑問句的回答

肯定回答：Yes,主語+was/were.

否定回答：No,主語+was't/weren't.

4.特殊疑問句：特殊疑問詞+was/were+主語+v-ing形式+其它?

What was he doing at this time yesterday?

昨天這個(gè)時(shí)候他在干什么?

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