2) relax: relaxing

use: using

think: thinking

do: doing

watch: watching

read reading

socialising

communicate: communicating

3)

1. skateboarding, soccer, badminton

2. novels, poems, magazines

3. news, reality shows, a comedy \

4. a new language, a skill

5. stamp collecting, origami paper folding 

6. go to local performances, visit museums 

7. visit relatives, go shopping, do homemade things

8. texting, going to the movies, going out

BT2 : 

relax ⇒ relaxing

think ⇒ thinking

use ⇒ using

do ⇒ doing

watch ⇒ watching

read ⇒ reading

socialise ⇒ socialising 

communicate ⇒ communicating 

BT3

1. skateboard, football/soccer, badminton

2. novel, poem, journal

3. news, reality show, a comedy

4. a new language, a skill

5. collecting stamps, origami paper folding 

6. go to a local performances, visit museums

7. visit relatives, go shopping,  make hand-made stuff/things

8. texting, go to the cinema, hang out