帮忙看一下下列几个句子是什么时态!
题目
帮忙看一下下列几个句子是什么时态!
1.I had been at the bus stop for half an hour when a bus finally came.
2.John Baird went off into the room where the picture would be shown.
3.This piece of good news greatly surprised all of my classmates.
4.I've been to Americe many times.
答案
1.过去完成时+一般过去
2.一般过去+过去将来
3.一般过去
4.现在完成
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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