(三)名词性物主代词(除its外)可与介词of搭配,构成双重所有格 a/an/some/any/no/another/each/such/several/which/this/that/these/those+名词+of+名词性物主代词。 如: a book of mine no fault of hers that pen of his 例句: In March 1998, a friend of Williams's...
构成:have been doing sth. 用法:表示从过去某一时间开始一直延续到现在的动作。这个动作可能刚刚结束,也可能仍在继续,并可能延续到将来。(表示到现在为止一直在发生或反复进行的动作) ––– How long have you been waiting here? ––– I have been waiting here ...
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