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來源：網絡資源 2022-03-13 21:30:03
肯定句：
主語+was/were+doing+其他
We were having class at this time yesterday.
昨天這個時候我們正在上課。
否定句：主語+wasn't/weren't +doing 其他We weren't having class at this time yesterday.
我們昨天這個時候沒上課。
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