YOU SAID:
i kind of forgot that swans have legs
INTO JAPANESE
白鳥が足を持っていることを忘れた
BACK INTO ENGLISH
I forgot that the swan has legs.
INTO JAPANESE
私は白鳥が足を持っていることを忘れていました。
BACK INTO ENGLISH
I forgot that the swan has legs.
You've done this before, haven't you.