Common English Usage Errors

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	Usage Error	Examples
1	Affect vs. Effect	This is by far the #1 English usage error. I actually believe that these two words are used incorrectly MORE OFTEN than they are used correctly. As a verb - Affect means to HAVE AN INFLUENCE upon something. Affect is seldom used as a noun, except by Norman Mailer. As a verb - effect means to CAUSE. As a noun - an effect is the RESULT of some action.
	Effect Verb Incorrect	This page will not effect you.
	Affect Verb Correct	This page will not affect you.
	Affect Verb Incorrect	This page will affect change. (COULD be correct, but probably is not what is meant)
	Effect Verb Correct	This page will effect change. (directly cause, or bring about change)
	Noun Incorrect	This page will not have any affect. (not a noun.)
	Noun Correct	This page will not have any effect.

2	Than vs. Then	Than refers to the COMPARISON of two items. Then refers to TIME. Many British speakers prefer to use the word "then", in instances when "than" would be correct.
	Incorrect Correct	Google is better then Yahoo. (common in British speakers) Google is better than Yahoo.
	Incorrect Correct	If Yahoo fails, than Google rules. If Yahoo fails, then Google rules.

3	There vs. Their vs. They're	There refers to place. Their refers to possession. They're is a contraction of "they are".
	Incorrect Correct	Google will prevail over there competition. Google will prevail over their competition.
	Incorrect Correct	The SEO manual is over their. The SEO manual is over there.
	Incorrect Incorrect Correct	It;' hard to tell what their going to do. It's hard to tell what there going to do. It's hard to tell what they're going to do.

4	Singular Subjects	Often, a person may think that a subject noun is plural, because it refers to a group of individuals, but the word "group" itself is SINGULAR. Some examples are group, company, club, organization, BBC, FBI, CIA, Google, etc. All are singular.
	Incorrect Correct	Google are going to take over the world (British speaker) Google is going to take over the world (US speaker).
	Incorrect Correct	The people at Google is going to take over the world. The people at Google are going to take over the world.

5	Articles of Speech	Nothing identifies Asian speakers faster than the non-usage of the articles of speech, because the articles of speech do NOT exist in Chinese, Korean, Vietnamese, etc. It is extremely difficult to convey to a nonnative speaker the proper use of the English articles of speech - a, an and the. Many become so confused that they refuse to use them at all, amplifying the problem. These errors are seldom made by native speakers.
	Incorrect	I am going to store. WHAT are you going to store? (Put in storage?)
	Correct	I am going to the store. (a known or previously mentioned store)
	Correct	I am going to a store. (an unspecified store, or a store previously not visited or discussed)
	Correct	I am going to an airport. (use an when the next word is a vowel - a, e, i, o or u, or SOME h words, depending upon the pronunciation. For instance, I am going to buy an heirloom - "a heirloom" is awkward. I am going to buy a harness - "an harness" is awkward.