Put the verbs in brackets into the correct form and read the jokes.
1) A son comes up to his father and asks, «Is it good to punish anybody for something this person ... (not to do)?» «Of
course not, Bobby», answers his father. «Well, I ... (not to
do) my homework, Dad».
2) Old doctor: You ... (to cure) your patient. What is there to
worry about now?
Young doctor: I don’t know which of the medicines ... (to
cure) him.