Yesterday he would made me sanwiches and would brought me a cup of coffee.
题目
Yesterday he would made me sanwiches and would brought me a cup of coffee.
when i had promblems with my homework last night,my father would did it for me.]
这上面两句跟下面这一句
Each time i gave him a problem he would solve it for me.
上面两句跟下面这句的区别在哪里?为什么一二两句,would后面跟过去式,而第三句,would后面却不跟过去式呢?
答案
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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