将句子变成一般疑问句然后变成否定句 The foreign teacher has come here since 2000.
题目
将句子变成一般疑问句然后变成否定句 The foreign teacher has come here since 2000.
还有一道题：This film has already begin.
答案
一般疑问句：Has the foreign teacher come here since 2000?否定句：The foreign teacher hasn't come here since 2000.一般疑问句：Has this film already begin?否定句：This film hasn't begun yet....
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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