You now know the rules. Mastery is knowing for effect.
When a learner makes a mistake, the system diagnoses the type of error (e.g., subject-verb agreement, tense shift, article misuse) and offers a micro-lesson plus targeted drills from earlier units. a complete course of english grammar
| Symbol | Name | Primary Use | | :--- | :--- | :--- | | | Period | End of declarative sentence; abbreviation | | ? | Question mark | End of direct question | | ! | Exclamation | Strong emotion or command | | , | Comma | List, after introductory phrase, before conjunction in compound sentence, non-restrictive clauses | | ; | Semicolon | Join two related independent clauses (no conjunction) | | : | Colon | Introduce a list, explanation, or quote | | ' | Apostrophe | Possession ( John's book ); Contractions ( don't ) | | " " | Quotation marks | Direct speech; titles of short works | | ( ) | Parentheses | Add non-essential information | | — | Dash | Sudden break or emphasis (stronger than comma) | You now know the rules