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
【牛津实用英语语法:190 现在完成进行时形式】相关文章:
★ 牛津实用英语语法:150 need not与其他各种形式的区别
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2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29