So let's say someone asks: ''Why do you keep your leftovers in the fridge?''
Which would be correct (if any)
- It helps to keep them fresh
- It helps keeping them fresh
You best choices are these: It helps keep them fresh. It helps to keep them fresh. (In this kind of construction "to" is optional after "help".
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You best choices are these:
It helps keep them fresh.
It helps to keep them fresh.
(In this kind of construction "to" is optional after "help". It's the only verb that allows the second verb both with and without "to".)
The construction with the -ing form is almost never used. I don't recommend that you use that pattern.
CJ