Say what you would do if…(Conditional) If I (to see) some schoolboys beating a smaller boy … If a child (to ask) me to help … If I (to hear) a person tell a joke about my best friend …
If I saw some schoolboys beating a smaller boy I would tell them to stop. If a child asked me to help I would ask what's wrong. If I heard a person tell a joke about my best friend I would defend my best friend.