YOU SAID:
I like pineapples but I'm allergic
INTO JAPANESE
私はパイナップルが好きですが、アレルギーがあります
BACK INTO ENGLISH
I like pineapple but I have allergies
INTO JAPANESE
パイナップルは好きですがアレルギーがあります
BACK INTO ENGLISH
I like pineapple but I have allergies
That didn't even make that much sense in English.