We should never forget one's helping.

Please correct my sentence.
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Comments  (Page 2) 
Hi Gary,

Although there are more ways than one to say it, you may want to try this:

We should not forget those who have helped us.
Maybe like this: "We should never forget one's help." Is it correct?
Students: We have free audio pronunciation exercises.
It sounds strange to mix "we" and "one's" help.

If the concept is always remembering to offer help when we see a need, I would say, "We should never forget to help [others]".

If the concept is to appreciate help which is given to us, I would say, "We should never forget those who help us", or "We should never forget the help we are given".