YOU SAID:

I have definitely not done this before, ha ha.

INTO JAPANESE

私は間違いなくこれをやったことがあります。

BACK INTO ENGLISH

I have done this without doubt.

INTO JAPANESE

私は疑いもなくこれをやった。

BACK INTO ENGLISH

Without a doubt I've done this.

INTO JAPANESE

もちろん

BACK INTO ENGLISH

Sure

INTO JAPANESE

ああ　そうか

BACK INTO ENGLISH

- Oh! Did you? - Are they tall?

INTO JAPANESE

ああ　そうか

BACK INTO ENGLISH

- Oh! Did you? - Are they tall?