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Comparative structuresThere are three kinds of comparative structures:
1 - sentence connectors
2 - subordinating conjunctions
3 - correlative conjunctions
1- Sentence Connectors or conjunctive adverbsJoin two independent clauses. Independent clauses contain a subject and a verb or verb phrase. Independent clauses are complete sentences.
Amy is always on time. (independent clause because it has a subject and a verb phrase)
Her sister is not (also an independent clause because it also has a subject and a verb phrase)
We can use a sentence connector to join these two independent clauses.
Amy is always on time, however, her sister is not.
2 - subordinating conjunctionsAmy is always on time while her sister is not.
main & subordinate clausesWhen a subordinating conjunction joins two clauses it creates a main clause, Amy is always on time, and a subordinate clause, while her sister is not. A subordinate clause is a dependent clause or an incomplete thought. A dependent clause can not stand alone. It is not a complete sentence. For example, her sister is not, is an incomplete thought and does not mean anything on it's own.
use of commaWhile Amy is always on time, her sister is not.
3 - correlative conjunctionsuseful for discussing similarities
used to discuss two things that are true
ExampleBoth Amy and her brother are always on time
Both not true : neither / norNeither Amy nor her brother are late for meetings