As one of the first freshmen accepted into Penn's certified writing tutor program, Jessica spent years giving detailed feedback on sentence structure, punctuation, and usage. She unpacks grammar rules — subject-verb agreement, comma splices, dangling modifiers — by showing students how each rule sha...

Scoring a 1590 on the SAT meant Jai couldn't afford grammar mistakes on the Writing section, so he internalized the rules governing subject-verb agreement, parallelism, modifier placement, and comma usage at a granular level. He breaks grammar down into a decision tree: a small set of patterns that ...

Kate treats grammar as a logical system rather than a list of arbitrary rules, breaking down sentence structure the way an engineer might break down a schematic. She's particularly sharp on the mechanics that trip up student writers most often: comma splices, subject-verb agreement in complex senten...

Comma splices, dangling modifiers, subject-verb agreement — Erika zeroes in on the specific grammar patterns a student keeps tripping over rather than rehashing rules they already know. Her experience editing college essays and teaching SAT Writing gives her a sharp eye for the errors that cost poin...

Scoring a 1550 SAT and 36 ACT required Rhea to master the grammar rules that standardized tests love to exploit — comma splices, subject-verb agreement across long modifiers, and parallel structure in complex sentences. She breaks these patterns down into clear, repeatable rules so students can spot...

Clear technical writing demands precise grammar, and Jeffrey has spent years refining that skill through research papers, grant applications, and academic publications in his engineering PhD program. He digs into the mechanics that trip students up most — subject-verb agreement in complex sentences,...

Years of legal writing — where a misplaced modifier can change the meaning of a contract — gave Tiffany an unusually precise command of grammar. She unpacks rules around subject-verb agreement, comma usage, and parallel structure by showing students how each choice affects clarity, turning grammar f...

Running an SAT prep class in high school meant Samuel had to teach the Writing and Language section's trickiest grammar concepts — parallel structure, modifier placement, comma rules — to classmates who'd never thought about why sentences are built a certain way. His applied math training at Caltech...

Tony sharpened his grammar instincts across two very different arenas: coaching students through SAT Writing and Language questions and tutoring Mandarin Chinese, where explaining English grammar rules becomes essential for comparison. He digs into the logic behind comma usage, subject-verb agreemen...

Trained as a journalist at Columbia, Sharon treats grammar not as a set of arbitrary rules but as the mechanics behind clear communication. She digs into the logic of sentence structure — why a misplaced modifier changes meaning, how parallel construction strengthens a list, when a semicolon actuall...