Most commonly used incorrect words and Phrases in English Language
A/An
A is used of An and vice versa. Remember An is only used if the next word which ia anoun starts with vowel, otherwise you should use A.

Accept/Except
Accept: to take or receive
Except: to exclude or omit.

Adapt/Adopt
Adapt: To alter so as to fit.
Adopt: To take by choice into a relationship.

Adverse/Averse
Adverse: hostile or opposed,
Averse: having a strong feeling against

Advice/Advise
Advice: a noun, help.
Advise: a verb, to offer counsel.

Affect/Effect
Affect: almost always used as a verb, to have an influence on.
Effect: used as a noun, power to bring about a result.

Conscience/Conscious
Conscience: a noun, the ability to tell right from wrong in one's behavior.
Conscious: an adjective, having an awareness of one's existence, environment, or behavior.

Disinterested/Uninterested
Disinterested: means impartial.
Uninterested:not of interest

There's lots of/There are lots of
Correct usage There are lots of

e.g. and i.e.
Both e.g. and i.e. are abbreviations for Latin phrases. i.e.: "Id est" means that is. e.g.: means for example.

Farther/Further
Both these words mean "more far"
Farther: used with physical distance
Further: used with more abstract differences

Greater than/Greater then
It's always "greater than."

Could of, would of/could have, would have
It is always could have or would have.

Irregardless/Regardless
It's always regardless e.g. The king coninued in power, regardless of public opinion

Lay/Lie
Lay: to put or set down.
Lie: to be in a reclining position.

Lose/Loose
Loose: not tight or confined.
Lose: to be unable to find.

Moral/Morale
Moral: a lesson often found at the end of a story.
Morale: the emotional state of a group.

Passed/Past
Passed: a verb, moved on or ahead.
Past: a noun, events that have already happened.

Personal/personnel
Personal: relating to an individual, private.
Personnel: a group of people employed by a business.

Peaked/Piqued
Piqued means sharpened, excited, intensified, The correct usage is piqued not Peaked.

Site/Sight
Sight: the ability to see. "
Site: a place or location, such as a home page.

Sole/Soul
Sole: the bottom of the foot. Soul: the spiritual nature of humans

That/Which
that: is specific
which: is general.

To/Too
To: in a direction toward.
Too: in addition to.

Contractions
Contractions are two words made into one with an apostrophe.
It's:It's is a contraction of it is.
You're:You're is a contraction of you are.
They're:They're is a contraction of they are.

Possessives
Pronouns are substitutes for nouns. Possessive pronouns are substitutes for possessive nouns.
Its:Its is a possessive. "Its hair stood on end."
Your:Your is a possessive. "Keep your hands to yourself."
Their:Their is a possessive. "Their dog is so well behaved."

Using Apostrophes
The big question here is when to use apostrophes.Correct Usage "My PC's color is black".The possessives listed above (its and your) do not need apostrophes. But they are the exception to the rule; most other possessive words do need apostrophes. "The handphone is constantine's." "The bike is hers." Verbs NEVER need apostrophes.

Most common difference between British English and US English.
ise/ize :The words that end with 'ise' in British english will end in 'ize' in US english 's' is replaced by 'z'.
our/or :british has a 'u' between 'o' and 'r' while US english do not have it.colour/color
double L:e.g. cancelled/canceled, levelled/leveled This happens when L" is preceded by a single vowel when it is preceded by double vowel l is not doubled e.g. concealed.

A list of most commonly misspelled words in English
absence, abundance, accessible, accidentally, acclaim, accommodate, accomplish, accordion, accumulate, achievement, acquaintance, across, address, advertisement, aggravate, alleged, annual, apparent, appearance, argument, atheist, athletics, attendance, auxiliary, balloon, barbecue, barbiturate, bargain, basically, beggar, beginning, believe, biscuit, bouillon, boundary, Britain, Buddha, business, calendar, camouflage, cantaloupe, category, cemetery, chagrined, challenge, characteristic, changing, chief, cigarette, climbed, collectible, colonel, colossal, column, coming, committee, commitment, comparative, competent, completely, concede, conceive, condemn, condescend, conscientious, consciousness, consistent, continuous, controlled, coolly, corollary, convenient, correlate, correspondence, counselor, courteous, courtesy, criticize, deceive, defendant, deferred, dependent, descend, description, desirable, despair, desperate, develop, development, difference, dilemma, dining, disappearance, disappoint, disastrous, discipline, disease, dispensable, dissatisfied, dominant, drunkenness, easily, ecstasy, efficiency, eighth, either, eligible, emperor, enemy, entirely, equipped, equivalent, especially, exaggerate, exceed, excellence, excellent, exhaust, existence, expense, experience, experiment, explanation, extremely, exuberance, fallacious, fallacy, familiar, fascinate, feasible, fictitious, finally, financially, fluorescent, forcibly, foreign, forfeit, formerly, foresee, forty, fourth, fulfill, fundamentally, gauge, generally, genius, government, governor, grievous, guarantee, guerrilla, guidance, handkerchief, happily, harass, height, heinous, hemorrhage, heroes, hesitancy, hindrance, hoarse, hoping, humorous, hypocrisy, hypocrite, ideally, idiosyncrasy, ignorance, imaginary, immediately, implement, incidentally, incredible, independence, independent, indicted, indispensable, inevitable, influential, information, inoculate, insurance, intelligence, intercede, interference, interrupt, introduce, irrelevant, irresistible, island, jealousy, judicial, knowledge, laboratory, legitimate, leisure, length, lenient, liaison, license, lieutenant, lightning, likelihood, likely, longitude, loneliness, losing, lovely, luxury, magazine, maintain, maintenance, manageable, maneuver, marriage, mathematics, medicine, millennium, millionaire, miniature, minuscule, minutes, mischievous, missile, misspelled, mortgage, mosquito, mosquitoes, murmur, muscle, mysterious, narrative, naturally, necessary, necessity, neighbor, neutron, ninety, ninth, noticeable, nowadays, nuisance, obedience, obstacle, occasion, occasionally, occurred, occurrence, official, omission, omit, omitted, opinion, opponent, opportunity, oppression, optimism, ordinarily, origin, outrageous, overrun, panicky, parallel, parliament, particularly, pavilion, peaceable, peculiar, penetrate, perceive, performance, permanent, permissible, permitted, perseverance, persistence, physical, physician, picnicking, piece, pilgrimage, pitiful, planning, pleasant, portray, possess, possessive, potato, potatoes, practically, prairie, preference, preferred, prejudice, preparation, prescription, prevalent, primitive, privilege, probably, procedure, proceed, professor, prominent, pronounce, pronunciation, propaganda, psychology, publicly, pursue, quandary, quarantine, questionnaire, quizzes, realistically, realize, really, recede, receipt, receive, recognize, recommend, reference, referred, relevant, relieving, religious, remembrance, reminiscence, renege, repetition, representative, resemblance, reservoir, resistance, restaurant, rheumatism, rhythm, rhythmical, roommate, sacrilegious, sacrifice, safety, salary, satellite, scary, scenery, schedule, secede, secretary, seize, sentence, separate, sergeant, several, shepherd, shining, similar, simile, simply, sincerely, skiing, soliloquy, sophomore, souvenir, specifically, specimen, sponsor, spontaneous, statistics, stopped, strategy, strength, strenuous, stubbornness, subordinate, subtle, succeed, success, succession, sufficient, supersede, suppress, surprise, surround, susceptible, suspicious, syllable, symmetrical, synonymous, tangible, technical, technique, temperature, tendency, themselves, theories, therefore, thorough, though, through, till, tomorrow, tournament, tourniquet, transferred, truly, twelfth, tyranny, unanimous, undoubtedly, unnecessary, until, usage, usually, vacuum, valuable, vengeance, vigilant, village, villain, violence, visible, warrant, Wednesday, weird, wherever, wholly, yacht, yield, zoology