YOU SAID:

I'm actually half-decent at this

INTO JAPANESE

私は実際にはこれで半分まともです

BACK INTO ENGLISH

I'm actually half decent with this

INTO JAPANESE

私は実際これの半分まともです

BACK INTO ENGLISH

I'm actually half decent of this

INTO JAPANESE

私は実際にこれの半分まともです

BACK INTO ENGLISH

I'm actually half decent of this