join

I become a member.

私は入会します

I become a member of a club.

私はサークルに入会します

I become a member of a club at school.

私は学校でサークルに入会します

I become a member of a club at school this week.

私は今週学校でサークルに入会します

I become a member of a club at school this week together with my friend.

私は今週友達と一緒に学校でサークルに入会します