YOU SAID:

i ate cake last night

INTO JAPANESE

私は最後の夜ケーキを食べた

BACK INTO ENGLISH

I ate cake last night.

INTO JAPANESE

私は最後の夜にケーキを食べた。

BACK INTO ENGLISH

I ate the cake last night.

INTO JAPANESE

私は最後の夜、ケーキを食べた。

BACK INTO ENGLISH

I ate the cake last night.