助动词和实义动词能做谓语 am is are was were +doing这里的am is are was were 是助动词吗 doing是
题目
助动词和实义动词能做谓语 am is are was were +doing这里的am is are was were 是助动词吗 doing是
实义动词吗 doing不是非谓语动词吗
答案
am is are was were +doing这里的am is are was were 是助动词 doing是 实义动词do的现在分词形式,和 am is are was were 一起构成谓语
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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