Help please

Can someone answer this pls ill give brainliest both ser and estar mean ‘to be’. in what situations do we use estar? estar, venir, and ir are considered irregular verbs. what makes a verb “irregular”?

¿que tus amigos cuando te dieron el trofeo? de ti.

You a) you do not need the belt. he b) mr. robinson, needs to sing in music class. you c) you need to study in science class. i d) i do not need a uniform at my school.