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RCs make or break your GMAT.Practice RCs everyday!
Commas cannot join two independent clauses.Incorrect: Amy sings, she enjoys it.Correct: Amy sings; she enjoys it.Correct: Amy sings, and she enjoys it.
Scientists postulate that the magic particle exists. : IncorrectScientists postulate that the magic particle exist. : Correct
A subjunctive mood construction - (subject + bossy verb + that + base form of verb)
You can score the 99th percentile despite getting 20% questions incorrect.