Réponse:
Salut !
1) Nelson Mandela was sentenced to life emprisonment by the court.
2) Most of his friends were arrested by the police.
3) His family members were questioned by the police officers.
4) He was sent to Robben Island ( by them ).
5) He wasn't allowed to send letters to his wife ( by them ).
J'espère t'avoir aidé ! :))