Раскройте скобки, употребляя эквиваленты модальных глаголов в соответствующем времени. The goods (to be) to be delivered

The goods must be delivered in five equal lots.

Why do you have to reduce the prices for these goods?

He isn’t able to join us for dinner because he is very busy.

You have to translate the letters into Russian.

I\'m afraid we are not able to buy goods at these prices.

She did not have to take a taxi to get to the airport because she had a lot of time.

Our director told us that should come from abroad in a fort night.