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5. Missing Commas After Introductory Phrases and Clauses 🟪 Be sure to place a comma after phrases and clauses that introduce a sentence.
6. Writing Run-On Sentences 🟪 Use an end punctuation mark after a sentence, or connect two sentences with a comma and conjunction. Otherwise, your sentences will run together.
7. Using Double Subjects 🟪 A sentence is incorrect if it contains a double subject—a subject with a pronoun right after it.
