New subordinating conjunctions and relative pronouns

Adverbial clauses and relative clauses are types of subordinate clause; they must be joined to a main clause. Adverbial clauses start with subordinating conjunctions; there are many of these with different purposes. Relative clauses start with relative pronouns; occasionally in informal language, the relative pronoun is omitted. Adverbial clauses can be placed before or after a main clause in an adverbial complex sentence. Relative clauses are placed after the noun or noun phrase they tell us more about (and can be at the end of a sentence).