This site from Tex's French Grammar provides a very clear and concise explanation of the proper formation and usage of the passe compose and l'imparfait. Lists common verbs and adverbs associated with either of the tenses. Provides good...

This site from Tex's French Grammar provides a clear and concise presentation of the l'imparfait. Shows stem and endings, provides written and audio examples and interactive practice exercises. Has links to various usages, such as states...