YOU SAID:

My mom is in equivalent to a duck.

INTO JAPANESE

私の母はアヒルに相当します。

BACK INTO ENGLISH

My mother is the equivalent of a duck.

INTO JAPANESE

私の母はアヒルに等しいです。

BACK INTO ENGLISH

My mother is like a duck.

INTO JAPANESE

私の母はアヒルのような人です。

BACK INTO ENGLISH

My mother is a duck.

INTO JAPANESE

私の母はアヒルです。

BACK INTO ENGLISH

My mother is a duck.