Ответ:

1.I lost a lot of weight, when i was ill.

2.She had already opened the letter. Before she realised it wasn't addressed to her.

3.The building had almost burnt down, by the time the fire brigade arrived

4.The artisan moulded the cooper so that to make bronze drum

5.Before you want to knit a hat for your friend, you

should watch tutorials on YouTube

6.While i was cleaning my cupboards, i found these photos

7.As soon as we realized that something had gone wrong, we saw him run towards us