这种时态由动词be的现在完成时形式＋现在分词构成：
肯定式：I have been working，he has been working等
否定式：I have not／haven’t been working等
疑问式：have I been working？等
否定疑问式：have I not／haven’t I been working？等
这种时态由动词be的现在完成时形式＋现在分词构成：
肯定式：I have been working，he has been working等
否定式：I have not／haven’t been working等
疑问式：have I been working？等
否定疑问式：have I not／haven’t I been working？等
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