Subordinate conjunctions can only introduce clauses or infinitives; they cannot relate other syntactic constituents. There are different kinds of subordinate coordinations with different syntactic behaviour: the subordinate coordination `que' which introduces noun clauses, subordinate coordinations which introduce subordinate interrogative sentences (e.g. `quand') and subordinate coordinations which introduce sentences (e.g. `parce que').
Test:
Given X a conjunction: If the second occurrence of X can be replaced by `que', then X is a subordinate conjunction.
Examples:
Test:
Given P, clauses:
If X does not realise a verb argument of
, then X is a subordinate conjunction.
Examples:
Test:
If X has as antecedent an adverb or an adverbial syntagm, then X is a conjunction.
Examples: