Rewrite the following sentence without changing their meaning

Rewrite the following sentence without changing their meaning
1.We haven't visited my grandfather for two months.
=> The last time..........
2. have studied English for three years.
=> I began........
3. My brother hasn't seen his best friend for nearly five years.
=> It's.......
4. When did you start learning English ?
=> How long.....
5. We started living here fifteen years ago.
=> We have.......