Discard the water layer, which contains the aspirin or acetominophen) and evaporate the chloroform layer to dryness under gentle heat. The result is codeine base, a white crystalline powder. Combine 20 mL pyridine and 25 mL conc. HCl in a beaker and heat strongly to 190C to drive off any water.
A simple sentence usually consists of a single finite clause with a finite verb that is independent. More complex sentences may contain multiple clauses. Main clauses (i.e. matrix clauses, independent clauses) are those that can stand alone as a sentence. Subordinate clauses (i.e. embedded clauses, dependent clauses) are those that would be awkward or incomplete alone.
In English grammar, a dependent clause is a group of words that has both a subject and a verb but (unlike an independent clause) cannot stand alone as a sentence. Also known as a subordinate clause. Dependent clauses include adverb clauses, adjective clauses, and noun clauses. Although exceptions can be found, a dependent clause at the beginning of a sentence is usually followed by a comma (as in this sentence).