Помогите,пожалуйста,раскрыть скобки

1) If we (not to have) much luggage we shouldn't have taken a taxi.
2 I've heard them (to quarrel) several times.
3 He told her that he (to leave) town very early the following morning.
4 We (to be) to meet at five but I was late.
5 All the contracts (to sign) by the President today.