急求英语16时态的总结归纳!
题目
急求英语16时态的总结归纳!
答案
1一般现在时 do/does 现在进行时be doing 现在完成时 have/has done 现在完成进行时have/has been doing
2.一般过去时 did 过去进行时 were/was doing 过去完成时 had done .过去完成进行时 had been doing
3.一般将来时will/shall do 将来进行时 will /shall be doing 将来完成时 will /shall have done 将来完成进行时will/shall have been doing
4.一般过去将来时 would/should do 过去将来进行时 would/should be doing 过去将来完成时would/should have done 过去将来完成进行时would/should have been doing
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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