1 We have been here since ten years ago.------------------------
题目
1 We have been here since ten years ago.------------------------
2 I borrowed a book a week ago.
------------------------------------
3 The boy bought the computer two years ago.
----------------------------------------------
4 He has been in beijing for ten years.
-----------------
5 It is two years since he died.
-------------------------------
答案
1 We have been here for ten years
2 I have kept the computer for two years
3The boy bought the computer for two years
4 He has been in beijing since ten years ago
5 He has been dead for two years
我也刚学 还不完全肯定
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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