Read these sentences and fill in the gaps with the correct form of the verb in the past simple or present perfect.
Example 0. We _________(visit) grandparents last week.
Answer 0. visited
Example 1. They _________ (work) here for five years.
Answer 1. have worked
1. I (work) here since 2015.
2. I (play) tennis since 11:30.
3. We (know) each other since 2014.