YOU SAID:
I have to feed my cat at 11 tonight.
INTO JAPANESE
私は今夜11時に猫に餌をやらなければならない。
BACK INTO ENGLISH
I have to feed my cat at 11 o'clock tonight.
INTO JAPANESE
私は今夜11時に猫に餌をやらなければならない。
BACK INTO ENGLISH
I have to feed my cat at 11 o'clock tonight.
You've done this before, haven't you.