Change these sentences into the present perfect tense, use the words in the brackets: I first started to play the guitar when I was 16 (since)

Change these sentences into the present perfect tense, use the words in the brackets.
1. I first started to play the guitar when I was 16 (since)
- I have ……… I was 16
2. This is their first visit to the Greek island. (never)
- They ……… the Greek island before .
3. This is not our first time at a rock concert. (already)
- We ……… to a rock concert.
4. She arrived a few minutes ago. (Just )
- She ……… arrived.
5. He came to live here two years ago. (For )
- He ……… two years.
6. She hasn't phoned her mother yet. (still)
- She ……… her mother.
7. I started this letter a week ago. (writing)
- I ……… this letter for a week.
8. The snow started this morning and it is still snow. (been)
- It ……… since this morning.
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