YOU SAID:

I have no idea what to say, but sure thing

INTO JAPANESE

私は何を言うか分からないが、確かなこと

BACK INTO ENGLISH

I don't know what to say, but I'm sure

INTO JAPANESE

私は何を言うべきか分からないが、私は確信している

BACK INTO ENGLISH

I don't know what to say, but I'm sure