ESL: Verbals: Gerunds, Participles, and Infinitives

http://owl.english.purdue.edu/handouts/print/grammar/g_verbals.html Brought to you by the Purdue University Online Writing Lab at http://owl.english.purdue.edu/index.htm.

I've recommended the OWL site before, which are particularly well done web sites on grammar and writing skills. This site has good explanations, points to remember and exercises, with answer keys.