Воткните походящие по смыслу модальные глаголы (can, could, must, may, might)

Вставьте походящие по смыслу модальные глаголы (can, could, must, may, might) и переведите предложения. Помните, что у модальных глаголов есть заменители (have to, has to , had to , am/is/are to , was/were to), которые придется употребить в некоторых временах.
1. You have your passport about you, if you want to open a bank account.
2. It was so dark; we to switch on the light.
3. You find something useful in IT technologies in on-line journals on this subject.
4. Students use PCs in the computer centre in the library.
5. In many large shops you pay by credit cards now.
6. The weather forecast says it rain in the afternoon.
7. The IT consultant was very good; he answer all our questions.