Carol Rose
Basic
Here's a collection of links on using the correct word. (Isn't English fun??? LOL!!):
http://www.dailywritingtips.com/passed-vs-past/
http://www.dailywritingtips.com/that-vs-which/
http://www.dailywritingtips.com/inquire-vs-enquire/
http://www.dailywritingtips.com/cannot-or-can-not/
http://www.dailywritingtips.com/wether-weather-whether/
http://grammarist.com/usage/whos-whose/
http://grammarist.com/spelling/peak-peek-pique/
http://leefe.ratestheworld.com.au/2006/08/28/incase-or-in-case/
http://dictionary.reference.com/browse/encase
http://www.towson.edu/ows/exercises/indexcommonlyconfusedwords.aspx
http://www.dailywritingtips.com/passed-vs-past/
http://www.dailywritingtips.com/that-vs-which/
http://www.dailywritingtips.com/inquire-vs-enquire/
http://www.dailywritingtips.com/cannot-or-can-not/
http://www.dailywritingtips.com/wether-weather-whether/
http://grammarist.com/usage/whos-whose/
http://grammarist.com/spelling/peak-peek-pique/
http://leefe.ratestheworld.com.au/2006/08/28/incase-or-in-case/
http://dictionary.reference.com/browse/encase
http://www.towson.edu/ows/exercises/indexcommonlyconfusedwords.aspx