過去進行式
用來表示"過去時間的狀態"或者"在過去某一個時間點時段正在進行的狀態"
- What were you doing at 8 clock last night?
- It was raining at 4 clock this morning.
- Tim was watching TV, while I was cooking dinner.
- Judy was working in Taipei at that time.
和過去式比較
對於結果表示未知(或者是說從句子不能了解結果)
- We are building our company last year. 我們去年正在建立了我們的公司 (完成與否未知)
- We built our company last year. 我們去年建立了我們的公司
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