if you ____ free tomorrow you can go shopping with us.A are B will be C will D are going to be
题目
if you ____ free tomorrow you can go shopping with us.A are B will be C will D are going to be
为什么句中用are?而不用will be ,will,are going to be?
答案
亲,if 从句中一般将来时用一般现在时代替
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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