Last week, my friends and I went fishing. I heard two people talking beside us while fishing. I don't know them and will name them A and B. This is what they said.
A: How long have you been fishing today?
B: two hours
A: Have you caught any fish?
B: No, but I am trying to.
B finished his sentence with "to". Don't you need a verb after "to". Is it grammatically correct not to add a verb after it? Please explain it. Thank you very much.