очень нужно, помогите пожалуйстаTranslate these sentences paying attention to the modal

Очень необходимо, помогите пожалуйста
Translate these sentences paying attention to the modal verb "have to".
1. they would have to search high and low to find a better speaker.
2. they had tj search for a replacement.
3.you will have to keep your word. though I understand it is next to impossible.
4.to economize on the electricity to reduce the working hours.