In French, every noun is masculine or feminine, and adjectives change to match the person they describe. For nationalities the basic rule is simple: for a woman, add an -e to the masculine form. Marc est français, Léa est française. Adjectives that already end in -e, like belge, do not change.

Some endings are a little different: -ien becomes -ienne (canadien, canadienne), and -ais becomes -aise (sénégalais, sénégalaise). In writing you see the -e; in speech you hear the final consonant for the feminine: français sounds like 'fran-SAY', française like 'fran-SAYZ'.

Two differences from English: nationality adjectives are written with a small letter (français, not French), and after être you say Il est canadien with no article, not 'He is a Canadian'. Country names have an article: la France, le Canada, la Belgique, le Sénégal.