can't determine what the subject of the lesson is suppose to be

Hi Karen,

These are called subject pronouns and they go with verbs. In French, there are different forms of the verb which go with each pronoun. They vary much more than in English -

Taking the verb 'to go' in the present tense in English -

I go = je vais

you go= tu vas

he/she goes = il/elle va

we go = nous allons

you go =vous allez

They go = ils/elles vont

This is called 'conjugating' a verb.

Hope I have understood your query!