Подскажите. Модальный глагол

Перепешите следующие предложения; подчеркните в каждом из них модальный глагол или его эквивалент. Предложения переведите.

1) In order to compete in the market the company was to spend enough money on adverrtising.(in order to - для того чтобы)
2) As the demand of these goods is low, the producer has to decrease the price for them.
3) He might rely on bank credit.
4) The firm must provide quality certificates for all its goods.