请帮忙将下列句子改写成非谓语从句.
题目
请帮忙将下列句子改写成非谓语从句.
1when it is heated,metal expands.
2if it is true,it will cause us a lot of trouble.
3when you are in doubt ,tell the truth.it wil confound your enemies and astound your friends.
答案
保证准确!
1.When heated,metal expands.
2.If true,it will cause us a lot of trouble.
3.When in doubt,tell the truth.It will confound your enemies and astound your friends.
如果状语从句的主语是it或其和主句主语相同,且从句的谓语以be动词开头,则可以省略状语从句的主语和be动词,这就是所谓的非谓语从句.
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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．
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