accept- a verb meaning "to receive" 

except- a preposition meaning "other than" or "leaving out"

accuse- means "to blame" or "to bring a charge against"

allege- "to claim something that has not yet been proved"

adapt- "to change"

adopt- "to take as one's own"

advice- a noun meaning "an opinion"

advise- "to give an opinion to"

affect- almost always a verb, means "to influence" 

effect- may be used as a noun or as a verb. as a noun it means "result" As a verb, it means "to bring about" or "to cause"

allot- a verb meaning "to divide in parts" or "to give out in shares"

a lot- is an informal expression meaning "a great many." It should never be spelled as one word. 

all ready- two separate words used as an adjective, an expression meaning "ready" 

already- "even now" or "by or before this time"

both of these words are prepositions. 

among- always implies three or more. 

between- generally used with two things only

all together- "together as a single group" 

altogether- "completely" or "in all"

nonstandard: The baby is nowheres in sight.

correct: The baby is nowhere in sight. 

As to is awkward. Replace it with about. 

Nonstandard: He has no idea as to how to spend his money.

Correct: He has no idea about how to spend his money.

Do not use at after where. Simply eliminate it.

Nonstandard: We're lost and don't know where we are at.

Correct: We're lost and don't know where we are.

awhile- an adverb that in itself means "for a while" 

A while- is an article and a noun The expression is usually used after the preposition for

Do not use because after the reason. Say, "The reason...is that" or reword the sentence.

Nonstandard: The reason for his happiness is because he won. 

Correct: The reason for his happiness is that he won.

Do not use either expression. Use because or since instead.

Nonstandard: Being as (or that) I wanted a better score, I took the SAT again.

Correct: Because (or since) I wanted a better score, I took the SAT again.

beside- "close to" or "at the side of"

besides- "in addition to"

bust and busted are nonstandard. The present, past, and past principle of burst are all burst.

Nonstandard: The doctor will bust the blister or she busted the cellophane wrapper.

Correct: The doctor will burst the blister or She burst the cellophane wrapper.

This is a nonstandard expression. Use can't help plus a gerund instead.

Nonstandard: She can't help but want another chance. 

Correct: She can't help wanting another chance

different from, different than

Less Acceptable: His camera is much different than Arlene's. 

Preferred: His camera is much different from Arlene's.

doesn't- the correct verb form for the 3rd person singular subjects.

don't- used with all other subjects.

Nonstandard: She don't intend to go, It don't seem right, or The air conditioner don't work.

Correct: She doesn't intend to go, it doesn't seem right, and The air conditioner doesn't work. 

the past principle of do, should always follow a helping verb. 

Nonstandard: She done what was expected of her.

Correct: She has done what was expected of her.

"caused by" and should be only used when the words caused by can logically be substituted

Nonstandard: Due to an error, he received two checks.

Correct: His receiving two checks was due to an error.

replace this awkward expression with because or since. 

Less Acceptable: Due to the fact that he was ill, he stayed home

Preferred: Because (or since) he was ill, he stayed home. 

emigrate- "to move out of a country"

immigrate- "to move into a country"

Examples: Heidi emigrated from Austria to the U.S. in 1934.

In 1970, she immigrated to Israel.

enthused: is nonstandard

Replace it with enthusiastic

farther, further

farther: refers to distance

further: means "to a greater degree or extent" or "additional" 

fewer: is used with objects that can be counted

less: is used with qualities or quantities that can not be counted

former: refers to the first two previously mentioned items

latter: refers to the second

gone: the past principle of go. It should be used as a verb only with a helping verb. 

went: the past of go and is never used with a helping verb

in: refers to position

into: suggests motion

lay: means "to put or set (something) down" 

lie: means "to recline" 

learn, teach

learn: means "to acquire knowledge."

teach: means "to give knowledge to"

raise: usually takes a direct object

rise: never takes a direct object

set: "to put (something) in a certain place."

sit: "to be seated"

than: use in comparisons

then: an adverb, usually refers to time

their: a possessive pronoun, always modifies a noun

there: can be used either as an explanative at the beginning of a sentence or as a adverb

they're: a contraction for they are

to: a preposition, begins a phrase or an infinitive

too: an adverb. modifies adjectives and other adverbs. 

two: is a number

win: means "to achieve victory in" 

beat: "to overcome (an opponent)."