forms of the present progressive
一般现在时的形式（Forms of the Simple Present）4.现在进行时的形式（Forms of the Present Progressive）5.现在时动词：疑问句（Present Verbs: Questions）6.
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... 普通如今时的方式（Forms of the Simple Present） 如今停止时的方式（Forms of the Present Progressive） 如今时动词：疑问句（Present Verbs: Questions） ...
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T here are cases, however, where these two forms are not interchangeable in that the present perfective progressive has also the meanings of continuousness, temporariness and incompleteness .
但是，由于现在完成进行体还带有进行体的持续性、暂时性和未完成性的含义，有时就不可以与现在完成体互换使用。比较。
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