Previously, languages were shown to be able change grammatical relations to alter argument structure.
There are ways to shift the phrases within the clause without changing grammatical relations too.
The phrase that we’re asking a question about is first replaced by a suitable wh-word or wh-phrase. List of wh-words and the replacement type in brackets are below.
In wh-word fronting languages, wh-movement occurs and a gap/extraction site is left behind in the original place of the moved phrase that is replaced.
A dependency is then formed between the wh-phrase and the gap. The entity they both refer to is the same: e.g. the below subscript notated sentence shows “Who” and “[__]” refer to the same entity $i$.
[Who]$_i$ did Sam see [__]$_i$ at the bus-stop yesterday?
Note that we can’t fill in “[__]” without making it ungrammatical as a result.
Syntactic category: same as the phrase it replaces (NP/PP/CP)
“Wh-in-situ” refers to replacing the phrase with the wh-phrase but leaving it in position. Examples of wh-in-situ languages include Chinese, Japanese.
In many languages, wh expression precedes the arg/adj at the start of its parent clause (not necessarily the root!). This is known as wh-fronting.
Some languages like phrase accept both as grammatical in most cases. English also technically does but the in-situ form usually shows incredulity or is the speaker trying to clarify something they couldn’t hear.
In english, when multiple wh-questions exist, only one is fronted and the rest of the the wh-phrases will not be fronted (in-situ in this case!)
In some languages (e.g. Bulgarian), all the wh-phrases will be fronted.
Koj kogo kakvo e pital? who whom what is asked “Who asked whom what?”
Who, whom, what have to appear in this fixed order in Bulgarian.
However in other languages (even closely related ones) you don’t have to have them in a fixed order.
The relative clause is a subordinate clause modifying a head noun in the matrix clause.
Function: restricts the possible set of objects the head noun could belong to.
Properties:
Typological distinction: order of the relative clause and head noun.
There are languages which do not embed the relative clause but adjoin them to the matrix clause.
The relative clause may adopt the head noun into itself, with a relative marker $RM$ to signify this is the head noun being modified that belongs to its matrix clause.
Su > Direct Obj > Obj of adpos > Possessor > Obj of comparison
Each position on the hierarchy is a cut-off point for some Rel formation in some language(s).