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irregardless
Avoid this word. Use "regardless".
accuse, allege
Accuse means “to blame” or “to bring a charge against.” Allege means “to claim something that has not been proved.”
adapt, adopt
Adapt, a verb, means “to change.” Adopt, a verb, means “to take as one’s own.”
advice, advise
Advice is a noun meaning “an opinion.” Advise is a verb meaning “to give an opinion.”
affect, effect
Affect is almost always a verb meaning “to influence.” Effect, usually a noun, means “result.” Occasionally, effect is a verb meaning “to bring about” or “to cause.”
aggravate
Aggravate means “to make worse.” Avoid using this word to mean “to annoy.”
allot, a lot, alot
Allot, a verb, means “to divide in parts” or “to give out in shares.” A lot is an informal expression meaning “a great many” or “a great amount.” Avoid using it in formal writing. Alot is a non-standard spelling and should never be used.
all ready, already
All ready is an expression functioning as an adjective and meaning “ready.” Already is an adverb meaning “by or before this time” or “even now.”
all together, altogether
All together means “all at once.” Altogether means “completely” or “in all.”
among, between
Among and between are both prepositions. Among always implies three or more. Between is generally used with just two things.
amount, number
Use amount with quantities that cannot be counted. Use number with things that can be counted.
anxious
Anxious means “worried,” “uneasy,” or “fearful.” Do not use it as a substitute for eager.
anyone, any one, everyone, every one
Anyone and everyone mean “any person” and “every person.” Any one means “any single person (or thing),” and every one means “every single person (or thing).”
as
Do not use this conjunction to mean “because” or “since.”
as to
As to is awkward. Replace it with about.
at about
Avoid using at with about. Simply eliminate at or about.
awhile, a while
Awhile is an adverb, which in itself means “for a while.” A while is an article and a noun and is usually used after a preposition.
beat, win
Beat means “to overcome (an opponent).” Win means “to achieve victory in.” Do not use win in place of beat.
because
Do not use because after the reason. Say “the reason is … that” or reword the sentence.
beside, besides
As prepositions, these two words have different meanings and cannot be interchanged. Beside means “at the side of” or “close to.” Besides means “in addition to.”
bring, take
Bring means “to carry from a distant place to a nearer one.” Take means the opposite: “to carry from a near place to a more distant place.”
bunch
Bunch means “a number of things of the same kind.” Avoid using this word to mean “group.”
burst, bust, busted
Burst is the standard present, past, and past participle of the verb burst. Bust and busted are non-standard forms.
can, may
Use can to mean “to have the ability to.” Use may to mean “to have permission to” or “to be possible or likely to.”
can’t help but
This is a non-standard expression. Use can’t help plus a gerund instead.
clipped words
Avoid using clipped or shortened words, such as gym, phone, and photo, in formal writing.
condemn, condone
Condemn means “to express strong disapproval of.” Condone means “to pardon or overlook.”
continual, continuous
Continual means “occurring again and again in succession.” Continuous means “occurring without interruption.”
different from, different than
Different from is preferred.
due to
Due to means “caused by” and should be used only when the words caused by can logically be substituted.
due to the fact that
Replace this wordy expression with since or because.
emigrate, immigrate
Emigrate means “to leave a country for a new residency.” Immigrate means “to enter a country to establish a residency.”
farther, further
Farther refers to distance. Further means “additional” or “to a greater degree or extent.”
fewer, less
Use fewer with things that can be counted. Use less with qualities and quantities that cannot be counted.
former, latter
Former refers to the first of two previously mentioned items. Latter refers to the second of the two.
good, lovely, nice
Whenever possible, replace these weak and overused words with a more specific adjective.
hanged, hung
Use hanged to mean “executed.” Use hung to mean “suspended.”
in, into
In refers to position. Into suggests motion.
judicial, judicious
"Judicial" means "relating to the administration of justice". "Judicious" means "showing wisdom".
just
When "just" is used as an adverb meaning "no more than", it should be placed right before the word it modifies.
kind of, sort of
Do not use "kind of" and "sort of" to mean "rather" or "somewhat".
lay, lie
"Lay" means "to put or set (something) down". "Lie" means "to recline".
Lay principle parts – lay, laying, laid, and laid
Lie principal parts – lie, lying, lay, and lain
leave, let
"Leave" means "to allow to remain". "Let" means "to permit".
like
"Like" is a preposition and should not be used in place of the conjunction "as".
loose, lose
"Loose" is usually an adjective or part of idioms. "Lose" is always a verb.
mad
In formal usage, "mad" means "insane". Used informally, "mad" means "angry".
maybe, may be
"Maybe" is an adverb meaning "perhaps". "May be" is a helping verb and a verb.
only
"Only" should be placed in front of the word it logically modifies.
outside of
Do not use this expression to mean "besides" or "except".
parameter
This word is correctly used only in mathematical contexts.
persecute, prosecute
"Persecute" means "to subject to ill treatment". "Prosecute" means "to bring a lawsuit against".
plurals that do not end in –s
Words such as criteria, media, and phenomena are plural and should not be treated as if they were singular (criterion, medium, phenomenon).
precede, proceed
"Precede" means "to go before". "Proceed" means "to move or go forward".
principal, principle
"Principal" means "most important" or "chief". "Principle" means "a fundamental law".
raise, rise
"Raise" usually takes a direct object. "Rise" never takes a direct object.
real
"Real" means "authentic". The use of "real" to mean "very" or "really" should be avoided in formal writing.
set, sit
"Set" means "to put (something) in a certain place". "Sit" means "to be seated".
shape
The meaning of "shape" is "spatial form". In formal writing, avoid using "shape" to mean "condition".
slow, slowly
Although "slow" can now be used as either an adjective or an adverb, careful writers use it as an adjective.
so
"So" is a coordinating conjunction. It should be avoided when you mean "so that".
that, which, who
"That" refers to people or things; "which" refers only to things; "who" refers only to people.
till, until
These words are interchangeable. Be careful, however, of spelling.
unique
"Unique" means "one of a kind". It should not be used to mean "odd", "interesting", or "unusual".
when, where
Do not use "when" or "where" directly after a linking verb.
–wise
Avoid using this suffix to create new words for a particular situation.