Can someone explain unmodified and modified adverbs to me in french as it is confusing me for when to use il est and c'est

plz I'm very confused

Est-ce que tu vas à la bibliothèque? pourquoi? (2 points)

Can some one answer these questions for me ,

Can anyone translate this into french! ? (some of it’s translated but not everything) c - bonjour mademoiselle! comment allez-vous? s - bien! c - do you have need for assistance? s - oui, i have need for pencils c - i have pencils j - maman! i have need for bonbon s - non jonny, we are here for school supplies. j - but, i have need for candy. sofia and i are going to eat it. s - non, jonny. we have need for a backpack c - i have a backpack s - do you also have paper c - oui, i have paper j - maman, we are going to be late s- we are not going to be late, we have time. c - are you interested in this we have other variations. s - non, we already have that. c - we have a sale on this. s - non, merci j - i have need for that s - non jonny j - but we are in need of it. s - non jonny j - but we s - non j - d’ d’accord.. s - i’m sorry sir, i have need for erasers j - but have that. s - no you don’t. j - i have it. s - no, you don’t. j - d’ *mumbles* i have s - are you done? (jonny keeps mumbling) s - are you? j - c - are you interested in anything else? we are currently s - a sale. oui. i know. are you going to show me where the erasers are? or not. j - *mocks* are you going to show us where the erasers are or not? c - are you interested s - c- but we are.. s - having a sale! ? c - we end.