256 不定式的完成进行式
A 形式
to have been+现在分词:
He seems to have been spying for both sides.
他似乎一直在为两方面搞秘密情报。
B 用法
主要用于助动词之后和appear,seem之后,但也可以用在happen, pretend以及believe, know, report, say, understand的被动式之后:
―He says he was talking to Tom.
―He couldn’t have been talking to Tom.Tom wasn’t there.
―他说他当时在跟汤姆说话。
―他当时不可能在和汤姆说话。汤姆当时不在那里。
―I was following Peter closely.
―You shouldn’t have been following him closely;you should have left a good space between the two cars.
―当时我正紧紧地跟着彼得。
―你不应该紧跟着他;而应该使两车之间保持相当的距离。
He appears to have been waiting a long time.相当于:
It appears that he has been waiting a long time.
看来他已经等了很久了。
He pretended to have been studying.相当于:
He pretended that he had been studying.
他假装一直在学习的样子。