变单数第三人称,现在分词和过去时
题目
变单数第三人称,现在分词和过去时
get change visit sit watch enjoy talk clean spend cook
答案
get gets getting got
change changes changing changed
visit visits visiting visited
sit sits sitting sat
watch watches watching watched
enjoy enjoys enjoying enjoyed
talk talks talking talked
clean cleans cleaning cleaned
spend spends spending spent
cook cooks cooking cooked
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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