No One vs. Anyone
'No one' and 'anyone' are both indefinite pronouns that are used to refer to no person or thing in particular. Here, we will discuss these two pronouns.
Are They Opposites?
Anyone
Is 'Any One' Correct, Too?
The only way you might see the noun phrase 'any one' (with space between them) is when we want to refer to a member of a certain group.
'Who do you think did this?' 'It could be
'No One'
'No one' is another indefinite pronoun that refers to the absence of a person, i.e. it means 'not anyone; no person'. Sometimes, writers write 'no one' with a dash: 'no-one'.
Negative Makers
'Anyone' can be used in negative sentences and questions. But, 'no one' is a negative marker by itself and it can make a sentence negative.
wasn't at home.)
The verb is positive, but the sentence is negative, because of 'no one' which is a negative marker.
Can't
The sentence is negative, because the verb is negative, not because of 'anyone'.