If we can’t help doing something, we mean that we can’t stop ourselves doing that thing.
- He is a loud man, but you can’t help liking him.
- I couldn’t help hearing your conversation.
- I can’t help the way I feel about you.
Can’t help followed by but and infinitive without to. Same meaning as can’t help…..ing.
- I can’t help but wonder what Christmas presents I have.
- I can’t help wondering what Christmas presents I have.
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