fait ou fais

The verb ending changes depending on the subject of the verb. 

Je fais, tu fais, il fait, Marie fait etc, as per the lesson. Was your question related to a more specific example ? 

As you will find in further lessons, verb conjugation according to the subject/tense/mood is a major topic in French grammar ! 

When the subject is I the verb has to end in aid and when the subject is him  or on it is is in air . 

When the subject is I the verb has to end in aid and when the subject is him  or on it is is in air . 

the s ending is reserved for je and tu pronouns. While t ending it for il,elle and on pronouns.

the s ending is reserved for je and tu pronouns. While t ending it for il,elle and on pronouns.