Someone asks you - Are you good at biology?
As a tutor following replies come to my mind :
- I am not into it.
- I don't tutor biology
- That's not my area of expertise
Which of the above are correct? Any better way to reply back?
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I am not into it.
That is quite informal and I suspect would mostly be used by younger people
I don't tutor biology
That is grammatical but does not really answer the question "Are you good at biology" as you could be brilliant at it but not tutor it.
That's not my area of expertise
That is perfectly fine but quite formal. You would be more likely to use it in writing.
And as @Void mentioned in comments
I'm afraid not
is a very common and correct usage.