Use the 1st conditionals

1. If (finish)_______early, I will call you.
2. I (catch)___________the 7:00 train if I hurry up.
3. She will know the answer, if she (try)__________to understand.

1. If  I finish early, I will call you.2. I will catch the 7:00 train if I hurry up.3. She will know the answer, if she tries to understand.