● 約定

我保證。I promise.You can't tell anyone. I promise I won't.

我不能保證。I can't promise. *“不能保證，但可以試試”。表達想幫助對方的心情。You have to come. I'll try but I can't promise.

一定。Will do.Remember to bring the report. Will do.

我發誓。I swear. *語氣強烈。Are you sure? I swear.

請相信我。Trust me.I'm not sure. Trust me. Believe me.I know what I'm doing.You can trust me.Trust in me.

說到就得做到。A promise is a promise!I'm sorry I can't help you. You said you would. A promise is a promise! You promised! You can't go back on your promise now!