Lesson 4:An excited trip

6.29 Thursday

现在完成时:表示动作现存的结果,或者过去发生的事对现在的影响。

I've planted fourteen rose bushes so far this morning.
I have lived here for several years now and I've made many new friends since I have lived here.
He has retired now.他现在已经退休了
I haven't been very successful so far.
Have you ever been to Australia?
Have you read any good books lately?
The train has not arrived yet.

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