This new dictionary is very useful [helpful] to me.
对我来说这本新词典很顶事。
There is no easy solution to the problem of…, but… might be helpful / useful / beneficial.
的问题难以找到容易的解决方式，但是…可能会有帮助/有用/有益。
I want it to be something that is useful and helpful to you.
我想这是一件非常有用，而且能够帮助你。
Then I taught him everything that I thought would make him useful, handy, and helpful.
然后我教他的一切，我认为会令他非常有用，非常方便和有用。
This is the most helpful (useful) book of the three.
这是三本中最有用的书。
Computers are very useful and helpful.
电脑非常有用，也有益。
Computers are very useful and helpful.
计算机是非常有用和很有帮助。
Computers are very useful and helpful.
计算机是非常有用和很有帮助。
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