Just like in English, _alles_ (everything) and _iedereen_ (everyone) are independent pronouns: They do not precede another noun.
The Dutch do not make a distinction between 'everyone' and 'anyone', they always say _iedereen_. The same goes for 'everything' and 'anything', for which the Dutch use the word _alles_.
Dutch | Application | English
alles | singular | everything, anything
iedereen | singular | everyone, anyone
Iedereen (everyone)
Although it refers to a group of people, _iedereen_ is regarded as a singular pronoun. The English pronouns 'everybody' and 'everyone' are also singular but in colloquial English we do come across sentences like " _Everyone_ has to brush _their_ teeth" (instead of the correct form: _his_ teeth). In Dutch, even colloquial Dutch, you will never hear this.
Iedereen kan leren fietsen. | Everyone (anyone) can learn how to ride a bicycle.
Hij kan met iedereen opschieten. | He gets along with everyone.
Heb je iedereen verwittigd? | Dit you notify everyone?
Alles (everything)
Just like _iedereen, alles_ is a singular pronoun.
Alles is veranderd. | Everything has changed.
Ik heb alles al gedaan. | I have done everything already.
Pronominal adverb _alles - overal_
If you already went through the [pronominal adverbs](#/lesson/Pronouns.Ad02), you know that we sometimes change the pronoun into an adverb when it is preceded by a preposition. We can (but in this case, do not have to) do the same with _alles._ For example, instead of _voor alles_ ('for everything'), we can say _overal voor_ ('everywhere for'). Note that we write _overal_ and _voor_ as two separate words (unlike most other [pronominal adverbs](#/lesson/Pronouns.Ad02)).
preposition + alles | | overal \+ preposition
In the examples below, both Dutch sentences are correct.
Hij heeft altijd op alles een antwoord. | He always has an answer to everything.
Hij heeft altijd overal een antwoord op. |
Ik kan met haar over alles praten. | With her, I can talk about everything.
Ik kan met haar overal over praten.