The French word ou often has the same meaning as the English word 'or' as well as it's other meaning which is the same as the English word "where".
Addition by crisdean : To express the meaning of...
Son, sa, ses The trick with French is knowing the gender of the noun the adjective is modifying. For example, if you're trying to say "his book" you would have to know that the word for book (livre)...