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
(四川专用)2016届高考英语二轮复习考前增分特训活页练:29
Egypt finds remains of 3,700-year-old pyramid 考古人员在埃及发现3700年前的金字塔
(四川专用)2016届高考英语二轮复习考前增分特训活页练:26
2016届高考英语二轮专题训练书面表达:11
(四川专用)2016届高考英语二轮复习考前增分特训活页练:25
(四川专用)2016届高考英语二轮复习考前增分特训活页练:24
2016届高考英语二轮专题训练书面表达:3
2016届高考英语二轮专题训练书面表达:6
2016届高考英语二轮专题训练书面表达:5
(四川专用)2016届高考英语二轮复习考前增分特训活页练:42