can,hear,pay,say,think,come,see,teath,spend,write的过去式和过去分词是什么?
题目
can,hear,pay,say,think,come,see,teath,spend,write的过去式和过去分词是什么?
答案
could could heard heard paid paid said said thought thought came came saw seen 是不是teach啊?你写的词好像没有啊 taught taught spent spent wrote writen
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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