YOU SAID:

If I had cake I would eat it

INTO JAPANESE

それを食べるケーキを持っていた場合

BACK INTO ENGLISH

If you were having cake and eat it

INTO JAPANESE

場合はケーキを持っていた、それを食べる

BACK INTO ENGLISH

If you had the cake and it eat

INTO JAPANESE

ケーキと食べることがある場合

BACK INTO ENGLISH

If you have the cake and eat it

INTO JAPANESE

場合は、ケーキを持っているし、それを食べる

BACK INTO ENGLISH

If you have the cake and eat it