If you're quoting someone such as, Karen said, "The grass is green." then you would only use the regular quotation marks. If you wrote something like

As Karen gave her speech, she quoted from her previous statement, "'The grass is green.'" , you'd have to use the single and double quotations.

Make sense?

[ September 12, 2005, 04:21 PM: Message edited by: Happy Wife & Mom 9804 ]