YOU SAID:
I had cereal for breakfast this morning.
INTO JAPANESE
私は今朝の朝食にシリアルを食べました。
BACK INTO ENGLISH
I ate cereal for breakfast this morning.
INTO JAPANESE
私は今朝、朝食にシリアルを食べました。
BACK INTO ENGLISH
I ate cereal for breakfast this morning.
You've done this before, haven't you.