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.
A clause is a group of related words containing a subject that tells readers what the sentence is about, and a verb that tells readers what the subject is doing. A clause comes in four types; independent, dependent, relative or noun clause. Independent Clause. An independent clause, also called a main clause, is a clause that can stand on its own. It contains all the information necessary to be a complete sentence. An independent clause has a subject that tells you what the sentence is about and a verb that tells you what the subject is doing.