Maintained by the Purdue University Writing Lab, this tutorial focuses specifically on the three prepositions mentioned in the title. After a general introduction, the site specifically discusses each preposition and presents examples.

This slideshow focuses on how to punctuate dialogue; it explains the rules for quotation mark and comma use in direct speech, when switching speakers, and when a single speaker speaks in multiple, continuous paragraphs. It provides...

The Awful Academic Talk and the Principles of Effective Talks are discussed and outlined with suggestions for a more interesting speech delivery. This was originally directed to those making academic presentations at a university or...

This site is provided for by the Fordham University. Read an excerpt from Clive's speech to the House of Commons regarding the rule of the East India Company over India. Offers excellent perspective on the imperialistic, superior...