All of vs. All – Which is Correct?

While both “all of” and “all” are grammatically correct, their usage depends on the context and the word that follows. “All of” is typically used before pronouns (e.g., all of us, all of them) and determiners (e.g., all of the books). “All” can be used more broadly as a determiner, pronoun, or adverb, often directly before nouns (e.g., all books). The “of” is sometimes optional, but often required for clarity or grammatical correctness.

All of or All – Which is Correct?

The distinction between “all of” and “all” often comes down to the type of word that immediately follows. Both are valid in American English, but they have specific grammatical roles and preferred uses. The core difference lies in whether a determiner (like “the,” “my,” “these”) or a pronoun (like “them,” “us,” “it”) is present.

Generally, “all of” is used when referring to a specific group, especially when followed by a pronoun (all of them) or a determiner plus a noun (all of the students). In many cases where a determiner is present, the “of” is optional (all of the students vs. all the students), though “all of” can emphasize the entirety of the group. “All” is used more broadly, often directly preceding a noun to refer to a general group (all students) or functioning as a pronoun itself (All is well).

The Best Trick to Remember the Difference

To remember the difference, use the “pronoun/determiner test”:

• If the next word is a pronoun (us, them, you, it, which) or a possessive pronoun (mine, yours), you must use “of”: all of us, all of them, all of it.
• If the next word is a determiner (the, my, these, those, his) followed by a noun, “of” is often optional but common: all of the books OR all the books.
• If the next word is a noun without a preceding determiner, you generally use “all” directly: all people, all cars.

Word/Phrase	Part of Speech/Function	Meaning	Example
all of	Quantifier phrase	The entire quantity or number of a specified group. Required before pronouns, often used before determiners.	All of them arrived late. All of the new reports are due.
all	Determiner, pronoun, adverb	The whole quantity or extent of; completely. Used before nouns, as a pronoun, or to modify verbs/adjectives.	All students must register. All is quiet. She was dressed all in black.

How to Use All of

“All of” is a phrase used to specify the entirety of a group, particularly when that group is introduced by a pronoun, a possessive noun, or a determiner. The “of” is crucial in certain constructions to maintain grammatical correctness and clarity.

Required Use:

• Before object pronouns: all of us, all of them, all of you, all of it.
• Before possessive pronouns: all of mine, all of yours.
• Before proper nouns or possessive nouns: all of Europe, all of John’s friends.

Optional Use:

• Before a determiner (like “the,” “my,” “these”) followed by a noun: all of the books or all the books. While both are correct, “all of the” can sometimes add a touch more formality or emphasis on the collective nature.

Using “all of” often makes the reference more specific, indicating a defined set. The tone is generally neutral and grammatically precise.

Example 1: All of us agreed to the proposal for the new project. (Required with pronoun “us”)

Example 2: All of the data needs to be analyzed by the end of the week. (Optional, but common with determiner “the”)

Example 3: All of his siblings attended the graduation ceremony. (Required with possessive determiner “his” followed by a noun)

Etymology of the word All of

The phrase “all of” combines two ancient words. “All” derives from Old English eall, meaning “the whole amount or number,” and traces back to Proto-Germanic *allaz. The preposition “of” comes from Old English of, meaning “from, out of,” which has roots in Proto-Germanic *af and Proto-Indo-European *apo-, meaning “away, from.” The pairing of “all” with “of” developed over time to specify the relationship between the quantifier and the noun or pronoun it modifies, often signifying “out of the total.”

How to Use All

“All” is a versatile word that can function as a determiner, a pronoun, or an adverb, each with its own set of rules and common applications. It signifies the entire quantity, extent, or number of something.

As a Determiner: When used as a determiner, “all” comes before a noun to indicate the entire group or quantity. It can be used with both countable and uncountable nouns.

• All students must complete the form.
• All information is confidential.

As a Pronoun: “All” can stand alone as a pronoun, referring to everything or everyone previously mentioned or understood.

• All is lost.
• She gave her all to the competition.

As an Adverb: “All” can modify verbs or adjectives, meaning “completely” or “entirely.”

• He was dressed all in white.
• She was all alone.

The use of “all” without “of” is common, especially when making general statements about a group or when “all” functions as a pronoun or adverb. The tone is typically direct and concise.

Example 1: All employees are expected to attend the mandatory training session. (As a determiner before a plural noun)

Example 2: After the storm, all was quiet again. (As a pronoun, referring to the situation)

Example 3: The children were all excited about the upcoming field trip. (As an adverb modifying the adjective “excited”)

Etymology of the word All

The word “all” has a long and robust history in the English language. It originates from the Old English word eall, which meant “every, entire, full, whole.” This Old English term itself evolved from the Proto-Germanic *allaz. Its roots extend further back into Proto-Indo-European, where related forms conveyed concepts of “beyond” or “other.” Over centuries, “all” has maintained its core meaning of encompassing the entirety, adapting its grammatical function to serve as a determiner, pronoun, and adverb in modern English.

Related Concepts

Understanding broader grammatical concepts like quantifiers, determiners, and pronouns can help clarify the usage of “all of” and “all” and prevent common errors.

• Quantifiers: Words or phrases that specify quantity or amount, such as “all,” “some,” “many,” “few,” “most.” “All” and “all of” both function as quantifiers, indicating a total amount or number. They help express how much or how many of something is being discussed.
• Determiners: Words that precede nouns and function to clarify what the noun refers to. Examples include articles (a, an, the), possessives (my, your, his), demonstratives (this, that, these, those), and quantifiers (like all, some, many). The presence or absence of a determiner following “all” often dictates whether “of” is used.
• Pronouns: Words that replace nouns or noun phrases. “All” can act as an indefinite pronoun, referring to an unspecified total. Understanding pronouns is crucial because “all of” is required before most object pronouns (all of them).

Examples from Media and Literature

• “It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, all of us were going direct to Heaven, all of us were going direct the other way.” – Charles Dickens, A Tale of Two Cities (1859)
• “And so, all of us, to the very end, are being educated.” – John F. Kennedy (1962)
• “In my experience, there is only one motivation, and that is desire. No reason or principle contain it or stand against it.” – Stephen King, The Stand (1978) (Here, “all” is implied as the subject of “contain it or stand against it,” referring to “reason or principle.”)
• “We were all in it together, but some of us were more together than others.” – George Orwell, Animal Farm (1945)
• “All the world’s a stage, and all the men and women merely players.” – William Shakespeare, As You Like It (c. 1600)

Practice Exercises

Choose the correct word or phrase to complete the sentence.

1. She invited ________ her friends to the party. (all / all of)
2. ________ the students passed the exam. (All / All of)
3. ________ them will be attending the conference in London. (All / All of)
4. He gave ________ his effort to finish the marathon. (all / all of)
5. ________ is fair in love and war. (All / All of)

Answer Key

1. all of (or all, but “all of her friends” is common and specific)
2. All of (or All, but “All of the students” is common and specific)
3. All of
4. all
5. All

All Synonyms

Synonym	Definition
Entire	Comprising the whole; complete.
Whole	Having all its parts or elements; complete.
Every	Referring to all the individual members of a group without exception.
Total	Comprising the whole number or amount.
Complete	Having all the necessary or appropriate parts.

Frequently Asked Questions

Question 1: Is “all of” always interchangeable with “all the”?
No, not always. While “all of the” and “all the” are often interchangeable before a noun (e.g., “all of the books” vs. “all the books”), “all of” is specifically required before pronouns (e.g., “all of us,” not “all us”) and possessive pronouns (“all of mine”). “All the” cannot replace “all of” in these cases.

Question 2: Can “all of” be used with uncountable nouns?
Yes, “all of” can be used with uncountable nouns, especially when referring to a specific quantity of that noun. For example: “All of the water spilled,” or “All of the information was processed.”

Question 3: When is “of” definitely necessary after “all”?
The “of” is definitely necessary when “all” is immediately followed by an object pronoun (us, them, you, it) or a possessive pronoun (mine, yours). It is also used before proper nouns or possessive nouns (e.g., “all of John’s belongings”).

Conclusion

Navigating the usage of “all of” and “all” requires attention to the grammatical context, particularly the word that follows. While “all” serves as a versatile determiner, pronoun, and adverb, “all of” is often essential when preceding pronouns or when a specific, definite group is being quantified. Remembering the “pronoun/determiner test” can be a reliable guide: use “all of” before pronouns, and consider “of” optional but common before determiners and nouns. Mastering this distinction enhances clarity and precision in your writing and speech.

Pro Tip: When in doubt, especially in formal writing, consider if the “of” makes the reference clearer or more specific. If “all” is immediately followed by a pronoun, always include “of” to maintain grammatical correctness and avoid sounding awkward or uneducated.