University of Texas at Austin
Tex's French Grammar: Possessive Adjectives/determiners
This site from the Tex's French Grammar is a wonderful site with clear explanation of the possessive adjectives/determiners, with usage examples (written and audio) and interactive practice exercises.
Study Languages
Study Spanish: Months, Seasons, and Dates
This online lesson is on the use of definite articles and numbers with months, seasons, and dates. A quiz follows the lesson to test the student's comprehension of this grammar principle.