These are all infinitive verbs - they don’t have a specific pronoun in front of them. You can conjugate them by this method:
1) Choose one of the verbs listed. For this example, I’m going to use ‘quitter’.
2) Remove the -er end. For conjunction of any verb ending in -er, -ir and -re, you need to remove them.
3) Now, if you want to say “I leave”, you put a ‘je’, as je means ‘I’ or ‘me’. Then, you add an -e to the end of the verb.
This is just a simple example, as there are many ways you have to conjugate a verb.
This image below will show you a guide on this method.
