YOU SAID:

I wish we could do more but I cannot

INTO JAPANESE

私は、もっと出来るのに出来ない

BACK INTO ENGLISH

I can do more, but can't

INTO JAPANESE

私より多く行うことができません。

BACK INTO ENGLISH

You can't do more than me.

INTO JAPANESE

私よりも多くを行うことはできません。

BACK INTO ENGLISH

You can't do a lot better than I.

INTO JAPANESE

あなたは私より多くを行うことはできません。

BACK INTO ENGLISH

You cannot do more than me.

INTO JAPANESE

あなたは私よりも多く行うことはできません。

BACK INTO ENGLISH

You cannot do more than me.