20 Abner looked behind him and asked, “Is that you, Asahel?” “It is,” he answered.

Read 2 Samuel 2:20 Using Other Translations

Then Abner looked behind him, and said, Art thou Asahel? And he answered, I am.
Then Abner looked behind him and said, "Is it you, Asahel?" And he answered, "It is I."
When Abner looked back and saw him coming, he called out, “Is that you, Asahel?” “Yes, it is,” he replied.