An infinitive is the basic form of a verb that hasn’t been changed by tense or subject. It will usually have ‘to’ in front of it, such as to see, to hear, to look, to play, etc. For example, in the sentence, ‘we wanted to see a film at the cinema’, to see is the infinitive. The above answer is wrong. Look at the options and look for a verb that has the word ‘to’ in front of it.