"The green lizard flies."

Translation: 초록색인 도마뱀이 날아요.

[Komerinam]

I don't think we need "인" here.

[PaulJones279857]

Is the 인 here short for 이는?

[Dakota750821]

The 인 is the adjective form of 이다.
So this phrase is saying that the lizard which is green.........

[astgarrido]

납니다 should also be accepted. This lesson has a lot of stuff to flag for

[LiaNatsya]

헐 괴물이다