YOU SAID:
i went to the mall and ate a duck
INTO JAPANESE
私はモールに行ってアヒルを食べました
BACK INTO ENGLISH
I went to the mall and had a duck
INTO JAPANESE
モールに行ってアヒルがいた
BACK INTO ENGLISH
I went to the mall and there was a duck
INTO JAPANESE
私はモールに行って、アヒルがいました
BACK INTO ENGLISH
I went to the mall and had a duck
INTO JAPANESE
モールに行ってアヒルがいた
BACK INTO ENGLISH
I went to the mall and there was a duck
INTO JAPANESE
私はモールに行って、アヒルがいました
it is unlikely that this phrase will ever reach equilibrium