"우리는 그걸 싸워?"

Translation: Do we fight that?

[raemation]

Why does 그걸 have ㄹ on the end instead of ㅅ? Is this a contraction of 그것을?

[Ash-Fred]

In colloquial language, you can say 그거 for 그것. Also in colloquial language, 를 can be shortened to -ㄹ after a vowel, which gives 그걸 (그거 + - ㄹ).

The Korean sentence is faulty because 싸우다 is not transitive in Korean; I will disable this exercise. We are sorry for the confusion.