YOU SAID:

i didn't knew duck were this thick

INTO JAPANESE

アヒルがこんなに厚いとは知らなかった

BACK INTO ENGLISH

I never knew ducks were so thick.

INTO JAPANESE

アヒルがこんなに太いとは知りませんでした。

BACK INTO ENGLISH

I had no idea ducks were that fat.

INTO JAPANESE

アヒルがそんなに太っているとは知りませんでした。

BACK INTO ENGLISH

I didn't know ducks were that fat.

INTO JAPANESE

アヒルがそんなに太っているとは知りませんでした。

BACK INTO ENGLISH

I didn't know ducks were that fat.