Common Grammar Mistakes

We've all made an occasional grammar faux-pas. Which ones are the most common? Here are a few:

WHO AND WHOM

This one opens a big can of worms. “Who” is a subjective — or nominative — pronoun, along with "he," "she," "it," "we," and "they." It’s used when the pronoun acts as the subject of a clause. “Whom” is an objective pronoun, along with "him," "her," "it", "us," and "them." It’s used when the pronoun acts as the object of a clause. Using “who” or “whom” depends on whether you’re referring to the subject or object of a sentence. When in doubt, substitute “who” with the subjective pronouns “he” or “she,” e.g., Who loves you? cf., He loves me. Similarly, you can also substitute “whom” with the objective pronouns “him” or “her.” e.g., I consulted an attorney whom I met in New York. cf., I consulted him. 

WHICH AND THAT

This is one of the most common mistakes out there, and understandably so. “That” is a restrictive pronoun. It’s vital to the noun to which it’s referring.  e.g., I don’t trust fruits and vegetables that aren’t organic. Here, I’m referring to all non-organic fruits or vegetables. In other words, I only trust fruits and vegetables that are organic. “Which” introduces a relative clause. It allows qualifiers that may not be essential. e.g., I recommend you eat only organic fruits and vegetables, which are available in area grocery stores. In this case, you don’t have to go to a specific grocery store to obtain organic fruits and vegetables. “Which” qualifies, “that” restricts. “Which” is more ambiguous however, and by virtue of its meaning is flexible enough to be used in many restrictive clauses. e.g., The house, which is burning, is mine. e.g., The house that is burning is mine.

LAY AND LIE

This is the crown jewel of all grammatical errors. “Lay” is a transitive verb. It requires a direct subject and one or more objects. Its present tense is “lay” (e.g., I lay the pencil on the table) and its past tense is “laid” (e.g., Yesterday I laid the pencil on the table). “Lie” is an intransitive verb. It needs no object. Its present tense is “lie” (e.g., The Andes mountains lie between Chile and Argentina) and its past tense is “lay” (e.g., The man lay waiting for an ambulance). The most common mistake occurs when the writer uses the past tense of the transitive “lay” (e.g., I laid on the bed) when he/she actually means the intransitive past tense of “lie" (e.g., I lay on the bed).

ENVY AND JEALOUSY

The word “envy” implies a longing for someone else’s good fortunes. “Jealousy” is far more nefarious. It’s a fear of rivalry, often present in sexual situations. “Envy” is when you covet your friend’s good looks. “Jealousy” is what happens when your significant other swoons over your good-looking friend.

FARTHER AND FURTHER

The word “farther” implies a measurable distance. “Further” should be reserved for abstract lengths you can't always measure. e.g., I threw the ball ten feet farther than Bill. e.g., The financial crisis caused further implications.

DISINTERESTED AND UNINTERESTED

Contrary to popular usage, these words aren’t synonymous. A “disinterested” person is someone who’s impartial. For example, a hedge fund manager might take interest in a headline regarding the performance of a popular stock, even if he's never invested in it. He’s “disinterested,” i.e., he doesn’t seek to gain financially from the transaction he’s witnessed. Judges and referees are supposed to be "disinterested." If the sentence you’re using implies someone who couldn't care less, chances are you’ll want to use “uninterested.”

IRONY AND COINCIDENCE

Too many people claim something is the former when they actually mean the latter. For example, it’s not “ironic” that “Barbara moved from California to New York, where she ended up meeting and falling in love with a fellow Californian.” The fact that they’re both from California is a "coincidence." "Irony" is the incongruity in a series of events between the expected results and the actual results. "Coincidence" is a series of events that appear planned when they’re actually accidental. So, it would be "ironic" if “Barbara moved from California to New York to escape California men, but the first man she ended up meeting and falling in love with was a fellow Californian.”

These are selections from: http://litreactor.com/columns/20-common-grammar-mistakes-that-almost-everyone-gets-wrong