For example, is the following sentence correct?

All is well!

If it is correct, then it means that "all" is singular.

Then how come the phrase

All hail Caesar

is used because it suggests that "all" is plural that's why it takes hail and not hails.

  • 2
    Does this answer your question? Can "all" be used with both singular & plural verbs?
    – user146310
    Dec 28, 2021 at 22:40
  • I'm leaving this question open as the proposed duplicate doesn't answer the question about why "All hail Caesar" is grammatically correct
    – gotube
    Jan 5, 2022 at 5:33

3 Answers 3


I had originally provided a comment to an answer (which is now deleted) saying that all can be either singular or plural. But that's not really correct. As a comment, I didn't have space to explain it properly.

All is used along with a subject that is either singular or plural.

I ate (all / most / some / part) of the cake.

Sometimes, all is used in a sentence with a subject that's considered singular, and sometimes in a sentence with a subject that's considered plural.

That is all.
All of the cars are white.

According to Merriam-Webster, all can be an adjective, adverb, or pronoun, and it can be used in sentences that involve singular nouns or plural nouns.

It can also be a noun itself. When it is, it's considered to be singular.

Whether it's used in a sentence with a singular subject or a plural subject is contextual.

All is well.

Here, it's used in a singular construction. It's being used in the same sense as everything would be:

Everything is well.

On the other hand, this would also be acceptable, if not common:

All (of them) are well.

In this case (assuming of them is not actually present in the sentence), all is being used as a pronoun in place of something like:

Things are well.
People are well.

Or, depending on how you look at it, it's not a pronoun but an adjective for something that simply isn't present:

All things are well.
All people are well.

All hail Caesar!

The verb form really has nothing to do with a singular or plural subject in this sentence.

What this sentence is actually saying is:

All (of you should / must) hail Caesar!

While the sentence is implicitly talking about the plural you, hail is the conjugation used for both the singular and plural form of you.


When all is used with a plural noun, it means every, and the verb agrees: All the cities were represented at the meeting. When all is used with a singular noun, with or without of, it means entire and takes a singular verb: All the city was in mourning.

  • I don't believe there is such a thing as all as a plural noun. When used as a noun I think it's singular. In the case of all the cities, the noun is the cities and all is an adjective. Which makes sense if you're able to say both all the cities and all the city. Jan 16, 2019 at 21:45

Is the word "all" singular or plural?  No, it isn't.  The word "all" does not have a grammatical number, which means that it does not conflict with either a singular or a plural referent. 

All is well.

In this sentence, the referent of "all" is singular.  It agrees with the form "is".  The only thing that marks grammatical number in that sentence is the verb form, so we must assume that "all" has a singular referent in this sentence. 

All are well.

In this sentence, the only thing that marks grammatical number is the verb form "are".  We must assume that "all" has a plural referent here.  Only a plural referent would agree with "are". 

If the question is "how is everything?", one sensible answer is "all is well".  In this case, "all" refers to everything, which is a singular idea.  If the question question is "how is your family?", one sensible answer is "all are well".  Here, "all" refers to the members of the family, which is a plural idea. 

The totality is good.  The individuals are good.  The word "all" might refer to either.

  • Thanks for the response. But, how do you then, explain the phrase "All hail, Caesar"? Why does it take "hail" and not "hails"?
    – Shivam
    Jan 16, 2019 at 17:38
  • 2
    As a command, "all, hail Caesar" shows no agreement. Imperatives employ bare infinitive forms. As a declarative statement, "all hail Caesar" is similar to "all are well" -- here perhaps meaning something like "all members of the population" rather than "all members of my family", but the form of the verb still establishes a plural referent. Jan 16, 2019 at 20:19

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