The Editor's Manual
Grammar, usage, punctuation, and style resource for editors, writers, and learners of the English language.
When “each” is part of the subject of a sentence, it is used with singular verbs, except when it follows a plural noun. “Each” may be used with a plural pronoun in an indefinite reference.
“That” introduces information that is essential to meaning and not enclosed in commas. “Which” introduces additional, optional details enclosed in commas. In British usage, it also introduces essential information.
Both “than I” and “than me” are grammatically correct, since “than” can be used as either a preposition or a conjunction. “Than I” is seen more often in formal usage.
“I” is a subject pronoun, while “me” is an object pronoun. In formal styles, use “I” in a compound subject and “me” in a compound object. “Me” is generally preferred in comparisons and after the “be” verb.
Pronouns starting with “some” and “any” indicate unspecified things and persons but convey different meanings and points of view in questions, statements, and conditionals.
“No” is more emphatic than “not any” and is used more often in formal contexts. “A/an” instead of “any” is used with singular countable nouns in negative statements. “Not a” and “no” are not interchangeable.
“It’s” (with the apostrophe) is a contraction of “it is” or “it has.” “Its” (without the apostrophe) is a possessive, used to show that one thing is related to another.
“Any” can be singular or plural, depending on whether you mean “at least one” or “one or more.” It is generally used with uncountable and plural countable nouns in questions and negative statements, though it may be used with a singular countable noun for emphasis.
One of a group is singular (“One of them is” not “are”). But when “one of the” is followed by “who” or “that,” check who is being described: the entire group or one of them.
“Either” is grammatically singular. In formal texts, prefer “either is” to “either are” (“Either of these is acceptable”). In informal usage, the word may be singular or plural (“Is/are either of them here?”).