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现在完成进行时(have/has been + 动词-ing)强调一个始于过去并持续到现在,或最近刚停止但结果仍然可见的活动的持续时间。
I am studying since 9am.
I have been studying since 9am. — 搭配"since"使用现在完成进行时。
She has been study all morning.
She has been studying all morning. — 在"has been"后的主要动词加-ing。
have been waiting
hasn't been feeling