Bonjour !
a. I have bullied my cousin.
b. My so-called friend has punched, hit and insulted me at school.
c. My phone has been robbed by my classmates;
d. The kids have followed me after school and they have thrown stones at me.
e. I am afraid because the big boy has told me I was fat and ugly.
f. My parents have convinced me that we must go to the police.
J'epsère t'avoir aidé. Bon courage !