Question

Your friend is very shy and doesn't take part is extracurriclar activities sports at school .his parents are worried that he doesn't mix with others but
studies all the time with your partners discuss.
what might be the reason for this and
what you can say or do to encourage your friend to interect with others.

Answer 1

the reason might she might be new for school and she woundnt get enough time 
to mingle with others
we should encourage her by making her our friend and understands her to mingle with others and to take part in extracurriculur activities.

Answer 2

The reason might be his shy nature. it could be possible that he wants to participate in extracurricular activities but may be he think of being lose and think that what other will say.

We can encourage him by being a good friend. His parents should talk to him in this regard and must solve his issues.