What is the conjugation for -re and -er verbs in french?

Your new boss just entered your office, he says "bonjour monsieur, comment allez-vous? ". how would you answer his question? by saying “ça va. et toi? ” by shake his hand and saying ”salut. et vous? ” by saying “bonjour. et toi? ” and shaking his hand. by shaking his hand and saying ”bonjour. bien et vous? ”

Explain what has to happen when you use être instead of avoir for the formation of the passé composé? il an english explanation with steps if possible

Which pair of verbs best completes this sentence? emmanuel: vous avez étudié l'économie à l'université? hélène: non, j’ai la physique et raphaël le chinois. a. étudiais, a étudié b. étudiais, étudiait c. étudié, a étudié d. étudié, étudiais