помогите пожайлуста
Поставьте глаголы, данные в скобках, в нужном времени:
John Smith is in prison. How did it happen?
If John (not / to oversleep), he (not / to be) late for work. If he (not / to be) late for work, his boss (not / to fire) him. If John (not / to lose) his job, he (not / to need) money and he (not / to rob) the bank. If he (not / to rob) the bank, the police (not / to arrest) him.