YOU SAID:

if you see that man promise me you will steal his hat

INTO JAPANESE

あの男が私に約束するのを見たら、あなたは彼の帽子を盗むだろう

BACK INTO ENGLISH

When you see him promise to me, you'll steal his hat.

INTO JAPANESE

彼が私に約束するのを見ると、あなたは彼の帽子を盗むでしょう。

BACK INTO ENGLISH

When you see him promise to me, you will steal his hat.

INTO JAPANESE

彼が私に約束するのを見ると、あなたは彼の帽子を盗むでしょう。

BACK INTO ENGLISH

When you see him promise to me, you will steal his hat.