Pattern 1: Independent clause [ , ] coordinating conjunction independent clause [ . ] - Doctors are concerned about the rising death rate from asthma., Pattern 2: Independent clause [ , ] coordinating conjunction independent clause [ . ] - Doctors are concerned about the rising death rate from asthma, but they don't know the reasons for it., Pattern 3: Independent clause [ ; ] independent clause [ . ] - Doctors are concerned about the rising death rate from asthma; they are unsure of its cause., Pattern 4: Independent clause [ ; ] independent marker [ , ] independent clause [ . ] - Doctors are concerned about the rising death rate from asthma; therefore, they have called for more research into its causes., Pattern 5: Dependent marker dependent clause[ , ] Independent clause[ . ] - Because doctors are concerned about the rising death rate from asthma, they have called for more research into its causes., Pattern 6: Independent clause dependent marker dependent clause [ . ] - Doctors are concerned about the rising death rate from asthma because it is a common, treatable illness., Pattern 7: First part of an independent clause [ , ] non-essential clause or phrase, rest of the independent clause [ . ] - Many doctors, including both pediatricians and family practice physicians, are concerned about the rising death rate from asthma., Pattern 8: First part of an independent clause essential clause or phrase rest of the independent clause [ . ] - Many doctors who are concerned about the rising death rate from asthma have called for more research into its causes.,

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