Can an adjective go just after a noun?
The teachers present in the hall are my life saviours.
In this sentence is using 'present in the hall' right or should I say 'presenting in the hall'?
Well, you could technically say either. But I doubt that you're trying to say that there are teachers in the hall showing a PowerPoint presentation.
In this instance, "present" is an adjective, not a verb, because it provides information about the noun ("teachers"). When "present" is an adjective, it is pronounced preh-zent (equal emphasis; sounds like the synoynm of "gift") rather than PREH-zent.
According to Wikipedia, it is a postpositively placed adjective:
In some languages the postpositive placement of adjectives is the normal syntax, but in English it is less usual, largely confined to archaic and poetic uses (as in They heard creatures unseen), phrases loaned from Italic languages, (such as heir apparent, aqua regia), and certain particular grammatical constructions (as in those anxious to leave).
Present as an adjective can be used prenominally and postpositively with differences of meaning.
(prenominal) in existence at the moment in time at which an utterance is spoken or written.
(prenominal) now in consideration or under discussion:
the present topic; the present author.
(postpositive) being in a specified place, thing, etc:
the murderer is present in this room.
"The teachers present in the hall are my life saviours."