Hi There,
I have Below some questions regarding preposition:
1. It is useful for/to me.
2. Medicine is useful for/to my headache
3. it is helpful for/to me.
4. It is beneficial for/to me.
Thanks,
You may use any of those, though 'to' sounds odd (for some reason) in #2.
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You may use any of those, though 'to' sounds odd (for some reason) in #2.