6.1 Noun Clauses can be subject or object of the verb, be complementary after the verb be , or follow a preposition.
Clauses describe or limit a noun or pronoun.
Modern usage does not place commas round restrictive relative clauses. In such clauses, British usage requires the use of commas round the relative clause. In Early Modern English, the protasis is sometimes introduced by and or an . 6.4 Ambiguous clauses Conjunctions may perform more than one function, and are no more immune to change in function than any other word. These ambiguities should not be seen as objections to traditional classification of clauses but as clues to the development of syntactical structures.