a verb infinitive is the basic form of a verb. for example, “to sing” is the infinitive form of a verb. you can recognise an infinitive in English as it begins with to.
in French, you can spot an infinitive by looking at the end of the verb. all French infinitives end in either -er, -ir or -re
for example, the infinitive of the verb “to sing” is chanter in French. this is an example of ER Verbs.