she swimming across the river she is swimming over the river 语法对吗
题目
she swimming across the river she is swimming over the river 语法对吗
答案
这是两个意思相同的句子吗?
she swimming across the river 这句是错的,swim不用加ing,可以用swim的过去时等等啊!
she is swimming over the river 对的.
（这一处over和across都行,只不过有细微的差别而已,你可以去瞧瞧over与across的区别!能查到的）
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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