Standard English Conventions: Grammar, Punctuation, and Sentence Boundaries
What this domain tests
This domain rewards knowing the rules, not ear alone. Concepts you must command: sentence boundaries (avoiding fragments and run-ons), comma use (between independent clauses, around nonessential elements, in lists), semicolons and colons, apostrophes (possessives vs. plurals, its/it's), subject-verb agreement (especially with interrupting phrases and inverted order), pronoun-antecedent agreement and case, verb tense and form, parallel structure, modifiers (avoiding dangling and misplaced ones), and punctuation of transitions.
Traps to watch for
- The comma splice dressed up: two full sentences joined by only a comma.
- The interrupting phrase: "The collection of rare stamps was sold" - the verb agrees with collection, not stamps.
- Essential vs. nonessential: commas around a clause that is actually necessary change the meaning.
- Transition punctuation: a conjunctive adverb like however between two sentences needs a semicolon (or period) before it and a comma after.
- Apostrophe confusion: students' work (plural possessive) vs. student's work.
Rule of thumb
For boundary questions, find the verbs and test whether each clause can stand alone. Two standalone clauses need a period, semicolon, or comma + coordinating conjunction (for, and, nor, but, or, yet, so). Strip interrupting phrases to check agreement.
Worked example
"The museum's new wing, which opened last spring, houses the sculpture collection." The clause is nonessential (removable without changing which wing), so it takes commas on both sides. Remove the commas and you wrongly imply there are other new wings.