YOU SAID:
I need to eat some pineapple dessert cake.
INTO JAPANESE
私はパイナップルのデザートケーキを食べる必要がある。
BACK INTO ENGLISH
I need to eat pineapple's dessert cake.
INTO JAPANESE
私はパイナップルのデザートケーキを食べる必要があります。
BACK INTO ENGLISH
I need to eat pineapple's dessert cake.
You've done this before, haven't you.