TOP 3 GRAMMAR MISTAKES:

 “Who” is a subjective pronoun, along with "he,""she," "it," "we," and "they." It’sused when the pronoun acts as the subject of a clause. “Whom” is an objectivepronoun, along with "him," "her," "it","us," and "them." It’s used when the pronoun acts as theobject of a clause. Using “who” or “whom” depends on whether you’re referringto the subject or object of a sentence. When in doubt, substitute “who” withthe subjective pronouns “he” or “she,” e.g., Who loves you? cf., Heloves me. Similarly, you can also substitute “whom” with the objectivepronouns “him” or “her.” e.g., I consulted an attorney whom I met in NewYork. cf., I consulted him.

Which and That

“That” is a restrictive pronoun. It’s vital tothe noun to which it’s referring. e.g., I don’t trust fruits and vegetablesthat aren’t organic. Here, I’m referring to all non-organic fruits orvegetables. In other words, I only trust fruits and vegetables that are organic.“Which” introduces a relative clause. It allows qualifiers that may not beessential. 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 togo to a specific grocery store to obtain organic fruits and vegetables. “Which”qualifies, “that” restricts. “Which” is more ambiguous however, and by virtueof 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 ismine.

 Affect andEffect

“Affect” is almost always a verb (e.g., Facebook affects people’s attentionspans), and “effect” is almost always a noun (e.g., Facebook's effectscan also be positive). “Affect” means to influence or produce an impression— to cause hence, an effect. “Effect” is the thing produced by the affectingagent; it describes the result or outcome.