Check this brief explanation of how to tell the difference between lay, a transitive verb, and lie an intransitive verb, and use them properly in English grammar.

This site explains the distinguishing nuances and uses in French of the verbs partir, sortir, quitter and laisser. Touches on transitive vs. intransitive. Provides interesting, short written and audio examples and practice exercises.

After a discussion and explanation of verbals in general, this site specifically discusses the gerund and the participle (with a link to the infinitive) and also provides examples of each.

This section on sentences includes information on subjects and predicates as well as objects and complements. It provides a brief overview along with several examples of usage and links to parts of the sentence.