大虾帮看一下写得对不？

最好不要用这么多否定来表示
会误解的 也觉得很冗长 难以理解
可以写成:
don't forget if you really want to do sth by heart, there is no difficult

说下中文吧。。MS有些问题

Don't forget that nothing is hard if you want to do it.

this is correct

Don't forget that nothing is hard if you want to do it.
应该是这样翻的.