6、過去進行時
We were talking about you a moment ago. I was playing the piano when she came in.
7、將來進行時
What will you be doing this time tomorrow? I believe he‘ll be coming soon.
8、現在完成時
8.1、過去發生但對現在有影響的動作，常跟時間狀語already， yet， never， before， recently， just， ever， once連用。
I have been to Peking many times. They have already published the results of their experiments.
8.2、從過去某時間開始一直延續到現在(可能還要繼續下去)的動作，常跟時間狀語since， for two years，
so far， in recent years等(使用延續性動詞)
He has lived here since 1984. I have studied English for two years.
1)他參軍已經有十年了。 ①He has been an armyman for ten years.
②It is(has been)ten years since he joined the army.
③He joined the army ten years ago.
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