Ответ:

1.Helen has liked rock music since she was ten.

How long has Helen liked rock music?

Since when has Helen liked rock music?

2.How long has Lisa known Robbie?

Lisa has known Robbie fpr three months.

3.Ruth and Colin have lived in their house since 1995.

How long have Ruth and Colin lived in their house?

4.Peter has had his pet dog since last year.

How long has Peter had his pet dog?

5.Maria has been at this school for three years.

How long has Maria been at this school?

Объяснение: