YOU SAID:

Certain things I can do and there's things that only I can do

INTO JAPANESE

私にできることと私にしかできないことがある

BACK INTO ENGLISH

I can do it and I can do it only

INTO JAPANESE

私はそれができるし私はそれができるだけ

BACK INTO ENGLISH

I can do it I can

INTO JAPANESE

それができる私はできる

BACK INTO ENGLISH

I can do it I can