YOU SAID:
I want cake for dinner.
INTO JAPANESE
夕食にケーキをします。
BACK INTO ENGLISH
Cake for dinner.
INTO JAPANESE
夕食はケーキ。
BACK INTO ENGLISH
The dinner was a cake.
INTO JAPANESE
夕食はケーキでした。
BACK INTO ENGLISH
Dinner was a cake.
INTO JAPANESE
夕食はケーキだった。
BACK INTO ENGLISH
Dinner was a cake.
You've done this before, haven't you.