Помогите с заданием пожалуйста :З

Задание № 8)
Заранее спасибо ^^

families.

mework at eight o'clock. 3. When she (to get) to the shop, it (to close). 4. The train (to leave) when he (to come) to the station. 5. We (to eat) everything by the time he (to arrive) at the party. 6. I (to know) that he (not to learn) the poem. 7. When they (to leave) the beach, the rain already (to start). 8. Arthur (not to know) that we already (to arrive). 9. When I (to come), I (to see) that mother (to cook) dinner. 10. My friend (to study) English before he (to enter) the institute. 11. The car (to go) when I (to look) into the street. 12. He (to take) the decision before I (to come). 13. Nick (return) from office by seven o'clock. 14. We (to get) to the stadium at four o'clock but the game already (to start). 15. She (to come) at six o'clock. 16. I (to think) that my parents already (to return). 17. He (to be sure) that we (not to recognize) him. 18. You (to find) your key which you (to lose) before? 19. Meg (to say) that she (to be) in this city. 20. The doctor (to arrive) when we already (to help) him.

Просто напишите 3 предложения)))

в скобках укажите функцию герундия.

1. There are some ways of obtaining high quality alloys. 2. Melting is very important in the
production of high-quality castings(