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English Tenses

someone was doing sth. at a certain time (in the past) - you do not know ... emphasis: length of time of an action. have/has + been + infinitive + -ing, I ...

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查詢 「have been doing用法」的人也找了：

  1. have been幾時用
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  3. have been ving用法
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  4. have been pp用法
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  5. have ving用法
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  6. have been後面加什麼
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  8. it has been用法
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