Master grammar, punctuation, and rhetorical skills
Learn when to use commas to set off non-essential clauses and phrases
My sister who lives in Boston is visiting next week.
Which is correct?
Master comma usage, semicolons, colons, dashes, apostrophes, and end marks
Master subject-verb agreement, pronouns, verb tense, and modifiers
Fix fragments, run-ons, comma splices, and ensure proper coordination and parallelism