12.present perfect(2)
A.just,already & yet
just和already位于过去分词之前 We've just come back from our holiday.
yet位于否定句或疑问句的句末 Has your course started yet?
B.for & since
用于表示某事开始于过去，并一直持续到现在。
for用于表示这段时间有多长 for about three years.
since用于表示这段时间开始于何时 since thursday,I think.
转载于:https://blog.51cto.com/tranceck/1263921
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