Today, we are going to talk about the present perfect continuous tense.
今天，我们谈谈什么是现在完成进行时。
The question is in the present perfect continuous so you will answer with the verb in the continuous.
For example：这个问题是用现在完成进行时来提问的，所以回答时也用进行时态的这个动词。
The second function of the present perfect continuous tense is to talk about an action that started in the past and it is still happening.
第二种：谈论一个起始于过去，但是现在仍在发生的动作。
We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.
现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。
We use the present perfect continuous (I have been doing) for situations over a short time. We use the present perfect (I have done) for situations that exist for a longer time.
现在完成进行时用在短时间的情况，现在完成时用于长时间的情况。
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