Affect/effect

When would these grades affect my cumulative GPA.

The accident had a very bad *effect OR affect *on her. :-s

The effect of the crash was horrifying.

Don't let your family crisis have a bad affect on you.

Have I used them right?


Thanks

"There are four distinct words here. When "affect" is accented on the final syllable (a-FECT), it is a verb meaning "have an influence on": "The million-dollar donation from the industrialist did not affect my vote against the Clean Air Act." A much rarer meaning is indicated when the word is accented on the first syllable (AFF-ect), meaning "emotion." In this case the word is used mostly by psychiatrists and social scientists-- people who normally know how to spell it. The real problem arises when people confuse the first spelling with the second: "effect." This too can be two different words. The more common one is a noun: "When I left the stove on, the effect was that the house filled with smoke." When you affect a situation, you have an effect on it. The less common is a verb meaning "to create": "I'm trying to effect a change in the way we purchase widgets." No wonder people are confused. Note especially that the proper expression is not "take affect" but "take effect"--become effective. Hey, nobody ever said English was logical: just memorize it and get on with your life."

From Common Errors in English.