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.