Make sentences. Use the Present Perfect Continuous

1. Tim-swim-three hours

2. My friends-play-the guitar-two years

3. You-bake-a cake-a long time?

4. Steve-write-a letter-2 o'clock

1. Tim has been swimming for three hours.

2. My friends have been playing the guitar for two years.

3. Have you been baking a cake for a long time?

4. Steve has been writting a letter since 2 o'clock.