The grammar symbols in full
Each part of speech has a specific physical shape and colour in the Montessori system. The symbols are traditional and consistent across AMI and AMS materials.
Noun. Large black triangle. Nouns are the names of things; the triangle is solid and definite, like a mountain or a pyramid.
Article. Small light-blue triangle. Articles (the, a, an) are small and go alongside nouns; the small triangle sits next to the noun's triangle.
Adjective. Medium dark-blue triangle. Adjectives describe nouns; the medium triangle is in the noun family colour-wise but distinct.
Verb. Large red circle. Verbs are actions; the circle is dynamic, rolling, active.
Pronoun. Tall purple triangle. Pronouns replace nouns; they are in the triangle family but a different colour.
Preposition. Green crescent. Prepositions show relationships (on, in, above, below); the crescent is a bridge-like shape.
Adverb. Small orange circle. Adverbs modify verbs; they are in the circle family but smaller.
Conjunction. Small pink bar. Conjunctions join clauses; the bar is a connector.
Interjection. Gold keyhole. Interjections are exclamations; the distinctive shape marks them as standing apart.
Symbols are physical objects, usually in wood or sturdy card, stored in a small wooden box. A full set costs £25-50. DIY versions can be made from card and paint; the shapes are standard and easy to source.
How the symbols are used
The child writes or is given a sentence. They take the symbols out of the box and place the correct one above each word.
"The dog runs quickly." Above "the": small light-blue triangle (article). Above "dog": large black triangle (noun). Above "runs": large red circle (verb). Above "quickly": small orange circle (adverb).
The child sees the sentence as a pattern of shapes. A short sentence has a few shapes; a complex sentence has many, clustered by function. The child who has done this work for a term can tell at a glance that a sentence is "triangle-triangle-triangle-circle-circle", which is to say "article-adjective-noun-verb-adverb", which is to say "The big dog runs quickly" or any sentence with the same grammatical structure.
This is the Montessori insight about grammar: it is a pattern, discoverable rather than teachable. The symbols make the pattern visible. The child does not memorise "a noun is the name of something"; they place black triangles above the names of things and, over time, the category builds itself.
The introduction sequence
One symbol at a time, over several months.
Weeks one to two: the noun. The child learns the large black triangle. "This is a noun symbol. Can you find the words in this sentence that are nouns?" The child places symbols above those words. Only one symbol in use.
Weeks three to four: the article. The small light-blue triangle is introduced. The child places both nouns and articles in sentences.
Weeks five and onward: each further symbol. Adjective, verb, pronoun, preposition, adverb, conjunction, interjection. One per fortnight roughly, though the pace varies. By the end of six months or so the child has all nine symbols.
Once all nine symbols are known, the child works with full sentences, placing every symbol in place. The category of each word is now a judgement the child makes, not a rule taught.
Word study: the sister practice
Grammar symbols handle parts of speech; word study handles the structure of words themselves.
Compound words. Words made of two other words (sandpaper, butterfly, classroom). Sorting activities: cards with compound words and cards with the component words; the child matches.
Prefixes. Un-, re-, dis-, pre-, post-, in-. Cards with the prefix on one side and a set of base words to attach to.
Suffixes. -ing, -ed, -ly, -ness, -tion. Same card-sorting format.
Singular and plural. Cards showing pairs: cat / cats; mouse / mice; child / children. Rule regulars and irregulars mixed.
Synonyms and antonyms. Pairs of words meaning the same (happy / joyful) or opposite (hot / cold). Card matching.
Homophones. Words that sound the same but are spelled differently (their / there / they're; to / too / two). Often harder than it looks for children; the work surfaces the differences systematically.
Word study cards are easy to DIY: index cards with the words in handwriting or printed, stored in labelled envelopes. Commercial Montessori word-study sets cost £20-40 but home-made work fine.
When the symbols and word study fit in
Grammar symbols: typically introduced at five or six, in late Plane 1 or early Plane 2. The child should be reading reliably (having finished the pink and blue series at minimum) before the symbols are introduced.
Word study: from five onwards, often alongside the grammar-symbol work. The child is reading and writing; word study explores the structure of what they are reading.
In Plane 2 (six to twelve), both the grammar symbols and word study become fuller. The grammar symbols extend into sentence analysis: a wooden stencil marking subject, verb, object, and other sentence elements by coloured arrows. The child parses complex sentences physically before they do so on paper. Word study extends into etymology, word families, Greek and Latin roots.
Common mistakes
Introducing the symbols before the child is reading. The symbols assume the child can read the words they are labelling. A pre-reading child using the symbols is following the adult's lead rather than making their own judgements.
Reciting definitions alongside the symbols. "A noun is a person, place, or thing." Not required. The child learns the category through placing symbols; the definition is a side-note at most.
Treating the symbols as a test. "What's this word's symbol?" said as a challenge moves the work from exploration to examination. The child should be placing symbols on sentences of their own choice and discussing as they go.
Skipping word study because it seems old-fashioned. Compound words, prefixes, suffixes are part of reading comprehension. A child who can break "impossibility" into its components (im + possible + ity) decodes the word's meaning without needing to be told it.
Treating the two as separate subjects. Grammar symbols and word study interact: the child places a "noun" symbol above "impossibility", then does the word-study work on the word's construction. The interplay is the point.
A real family's grammar year
A dad we will call Owen introduced the grammar symbols to his six-year-old daughter in September of her first year of formal Montessori after-school work. He bought a set from Etsy for £22.
September to November: the noun and the article introduced. His daughter placed black triangles and light-blue triangles on short sentences he wrote for her on index cards. By November she was placing them on sentences in her own writing.
December to February: adjectives, verbs, pronouns. Her sentences were becoming more complex; the combination of triangles (noun family) and circles (verb family) was visually obvious to her.
March to July: prepositions, adverbs, conjunctions, interjections. By the end of the school year she had all nine symbols and was doing sentence-level work, sometimes including multiple clauses with conjunctions.
Alongside, word study ran through the year: compound words in autumn, prefixes in winter, suffixes in spring, homophones in summer. About half an hour a week on each activity, sometimes more when a specific word caught her interest.
By the end of the year her parsing of written English was ahead of where Owen expected for a six-year-old. The grammar symbols in particular had made abstract grammar feel like a sorting task.