нужна помощь, пожалуйста - выполнить упражнение на английском

Откройте скобки. Используя Past Indefinite, Past Continuous, Past Perfect and Past Perfect Continuous.

1. I (to write) the letter. I (to try) to write it for weeks. 2. He (to know) the girl since she (to be) a small child and (to manage) her affairs since she (to come) of age. 3. Lanny (to say) nothing till they (to be) in the dressing-room where they (to leave) their coats. 4. He (to be) quite sure he (to see) that face somewhere. She (to ask) me (to help) her. 5. She (to ask) me to help her because she (to know) that I still (to work) for you. She (to know) I (to help) you for years. She (to know) I (to help) you to solve that missing luggage case. 6. By midnight she (to lose) hope to ever see me again and (to start) to phone the hospitals. 7. The cheerful girl who (to come) in with Eve (to be introduced) at last. 8. I (to learn) that nothing (to be done) though I (to leave) detailed instructions.