Помогите, пожалуйста, с английским 11 класс.C) 1. Rewrite the following sentences

Помогите, пожалуйста, с английским 11 класс.
C) 1. Rewrite the following sentences with used to/didnt use to or would/wouldnt. In some cases both used to and would are possible.

1. In the 1980s only a small number of people knew how to use the Internet, now its very different.

2. Every time he came to visit me in Warsaw my friends gave a part

3. When Susan was a student she never talked about her friends behind their backs.