牛津实用英语语法:190 现在完成进行时形式
发布时间：2016-02-29 编辑：查字典英语网小编
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/havent been working等
疑问式：have I been working?等
否定疑问式：have I not/havent I been working?等
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