Помогите, плиз)

Употребите указанные в скобках глаголы в нужной форме, измените порядок слов и вставьте частицу to, где необходимо.

1. They (should/ not) tell the manager about their difficulties.
2. We (have) cope with a lot of difficulties last year.
3. The country (have) reduce prices for its goods if the demand falls.
4. The economist (be) finish the analysis before the manager makes a decision.
5. The seller (be) deliver the goods as soon as the buyer paid for them.
6. He (ought) follow their advice?
7. The firm (have) buy new equipment or it (can) use old machines?
8. He (have/ not) pay any tax last year.

1. Shouldn't 2. Have to 3 has to 4 will 5 will 7 does the firm have to buy, can 8 didn't have to pay