Sentence Craft Lab
Fix fragments, commas and modifiers one sentence at a time.
Sentence Craft Lab is a grammar and usage game for high school writers. It starts with clauses, the building blocks of every sentence, and then moves on to fragments, run-ons and comma splices. Students decide which version of a sentence follows the rules of standard edited American English.
The levels continue with commas, semicolons, colons and apostrophes, then subject-verb and pronoun agreement, steady verb tense, parallel structure, dangling modifiers, active and passive voice and wordy phrases. Each wrong option breaks exactly one rule, so every question has one clear answer and a reason behind it.
What children practice
- Tell independent clauses from dependent clauses and name sentence types
- Repair fragments, fused sentences and comma splices
- Place commas after opening clauses, in lists and around extra information
- Use semicolons, colons and apostrophes, and sort out its, it's, there and their
- Match verbs with their subjects and pronouns with their nouns
- Keep tense steady, build parallel lists and fix dangling or wordy sentences
Levels
- Clauses: Independent and dependent
- Sentence boundaries: Fragments and run-ons
- Commas: Nine comma rules
- Marks and apostrophes: Semicolons, colons, apostrophes
- Agreement: Verbs and pronouns
- Tense and parallel: Consistent and matching
- Modifiers and voice: Dangling, passive, wordy
- Course mix: Everything
How it works
- Eight levels run from clauses to modifiers and voice, and the final level mixes every kind of question.
- Students pick the correct version, tap the faulty word or clause, sort sentences into groups, match terms or put parts in order.
- Levels open one at a time after five correct answers and a short stretch of timed practice.
- A speaker button reads each question aloud, and the Need a hint? button offers up to three nudges.
Best for: A good fit for grades 9 to 12 when a student wants steady practice with the conventions of writing, before essays or alongside a grammar unit.
Tip for parents: Ask your child to read a sentence from their own essay aloud and say where it stops. Hearing where a sentence really ends is the quickest way to catch a splice or a fragment.
Questions parents ask
Does the game test the Oxford comma?
No. Debated style choices, such as the Oxford comma, split infinitives and ending a sentence with a preposition, are left out. Each question has one answer that standard edited English supports.
Are the sentences taken from textbooks?
No. Every sentence, name and passage is original and was written for this game. Sentences are assembled from clause and phrase parts, with each wrong option breaking a single rule.
Is there help when a student is unsure of a term?
Level 1 teaches the grammar terms, including independent and dependent clauses and the four sentence types. Later levels keep using them, so students build up the vocabulary as they play.
Ready to try it?
Sentence Craft Lab is free with a parent account. A parent adds a child profile, and the child's progress is saved.