I'm afraid we can't work out the math problem unless the teacher helps us.
如果老师不帮助我们，恐怕我们解不出这道数学题。
If you don't know how to work out the math problem, you can get help from li lei.
如果你不知道如何计算出这道数学题，你可以从李雷那里得到帮助。
If you can't work out the math problem in this way, why not try doing it in another way.
如果用这种方法你解不出这道数学难题，为什么不试着换一种方式呢？
I work at the math problem for over one hour, but I can't work it out.
这道数学题我做了一个多小时，可是我解不出来。
I work at the math problem for over one hour, but I can't work it out.
这道数学题我做了一个多小时，可是我解不出来。
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