23-Negative Sentences

To make sentences negative, simply put ne and pas around the verb.  In spoken French, however, the ne is frequently omitted, but it cannot be omitted in written French.  And when you are replying "yes" to a negative question, you use si and not oui (though in Quebec, it is perfectly fine to just use oui).

Je suis du Canada.                                      I am from Canada.
Je ne suis pas du Mexique.                         I am not from Mexico.
Je suis française.                                          I am French (feminine.)
Je ne suis pas suisse.                                  I am not Swiss. (masculine or feminine)
Il est australien.                                            He is Australian.
Elle n'est pas danoise.                                 She is not Danish.
Elles sont des Etats-Unis.                             They are from the United States.
Ils ne sont pas du Portugal.                          They are not from Portugal. 
Je parle chinois et japonais.                          I speak Chinese and Japanese.
Je ne parle pas suédois.                              I don't speak Swedish.
Vous n'êtes pas du Brésil ?                        You aren't from Brazil?
Si, nous sommes du Brésil.                         Yes, we are from Brazil.