YOU SAID:

I am eating strawberries and cereal for breakfast. I don't know why I'm playing with this. I shouldn't be wasting my time.

INTO JAPANESE

私は朝食にイチゴとシリアルを食べています。なぜこれで遊んでいるのかわからない。時間を無駄にしてはいけません。

BACK INTO ENGLISH

I have strawberries and cereal for breakfast. I don't know why you are playing with this. Don't waste your time.

INTO JAPANESE

私は朝食にイチゴとシリアルを食べます。なぜこれで遊んでいるのかわからない。時間を無駄にしないでください。

BACK INTO ENGLISH

I have strawberries and cereal for breakfast. I don't know why you are playing with this. Don't waste your time.