Sentence Stretchers

A “how long can we make it?” word game. Start with a tiny two-word sentence — “Dog runs” — and take turns stretching it longer by adding one detail at a time: who, what kind, where, when, why, how. “The big brown dog runs.” → “The big brown dog runs fast across the muddy park.” → "…because he saw a squirrel." The sillier and longer it gets, the better — you’re literally exercising the length and complexity of the child’s sentences.

  1. Drop a tiny seed sentence. “Cat sleeps.” “Boy jumps.” Two or three words is the perfect start.
  2. Add one detail each, taking turns. Use the question engine — Who? What kind? Where? When? Why? How? You add where; the child adds why; back and forth.
  3. Let the child own each addition. Don’t make them repeat the whole growing sentence back (that turns it into a memory test) — just let it get longer together.
  4. Read the final monster sentence in a big voice. “The fluffy orange cat sleeps all day on the warm windowsill because she is tired from chasing string!” Celebrate the length.
  5. Then try shrinking. Pick the one most important detail and say the short version — a sneaky way to practise choosing what matters.

Variation: Stretch-a-picture — point at anything in view and grow a sentence about it. Roll-a-detail — a die where each number means add a who/what/where/when/ why/how. Two into one — combine two little sentences into one (“The dog ran. The dog was tired.” → “The dog ran until it was tired”).

Requirements

  • Space: Anywhere — especially good in the car or a waiting room
  • Surface: N/A
  • Materials: None; optional a six-sided die or six picture cues for who/what/where/when/why/how
  • Participants: 1 adult + 1 child; fun with siblings adding details around a circle
  • Supervision: Adult-led conversation

Rationale & Objective

This game directly exercises the two headline metrics of expressive grammar: mean length of utterance (MLU) and syntactic complexity. Brown (1973) established MLU as the principal index of early grammatical maturity, and Rice et al. (2010) give precise age norms — around 4.9 morphemes per utterance for a typical 5-year-old — so deliberately lengthening sentences pushes right at the developmental edge. Crucially, each kind of “stretch” adds exactly the structures that drive complexity: who/what kind elaborates the noun phrase (articles, adjectives), where/when adds prepositional phrases, how adds adverbs, and why/because adds a subordinate clause — the leap from simple to complex syntax. This mirrors Eisenberg’s (2013) grammar-facilitation sequence (sentence constituents → noun-phrase and verb elaboration → complex sentences) and the related technique of sentence combining (Eisenberg, 2014). The adult’s role — building onto the child’s words rather than replacing them — is the well-evidenced move of expansion/recast, which Cleave et al.’s (2015) meta-analysis found effective for grammar. Honest framing — longer must stay grammatical, not just longer; the aim is the child generating richer sentences, not parroting yours, so if a stretch turns into a run-on, model a clean version and move on, and watch for fatigue, since packing in clauses is genuinely effortful at this age.

Progress Indicators

  • Early: speaks in short 3–4 word subject-verb(-object) sentences (“dog runs”, “I want juice”); can add one element when asked (“big dog runs”) but rarely does so spontaneously
  • Developing: reliably adds an adjective plus a place or manner (“the big dog runs fast outside”); strings ideas mainly with “and”; sentences reach about 5–6 words; few subordinate clauses
  • Proficient: uses who/what/where/when/how on request and often spontaneously; “because/so/but” appear; produces 6–8 word sentences with a prepositional phrase and an adverb, and begins real subordinate clauses ("…because he saw a squirrel")
  • Advanced: spontaneously packs several details and at least one subordinate clause into one grammatical sentence, sustained across a story, and can also shrink a sentence to its most important detail; length serves meaning and grammar stays correct as sentences grow

Safety Notes

  • Build onto the child’s sentence rather than replacing it with your own better one — the goal is the child generating length, not repeating yours
  • Longer has to stay grammatical, not just longer; if stretching produces a run-on, model a clean version through a recast — don’t penalise, and don’t reward length for its own sake
  • No shaming and no drilling — never “say it the right way”; stop before it becomes a performance demand, since holding a growing sentence in mind is hard work
  • Worth an SLP’s view if, by 5, the child’s utterances stay very short and simple with no conjunctions or subordinate clauses and word-order errors that don’t resolve — reduced sentence length is one of the more reliable markers of expressive delay

Hints

  • Playfulness: announce it as a record attempt — “let’s see how loooong we can make it!”; use absurd seed sentences (“the pickle dances”); draw the sentence physically getting longer on paper
  • Sustain interest: rotate the engine — one day add only “where” details, another day only “why”; play stretch-a-picture with whatever’s out the car window; bring in a roll-a-detail die
  • Common mistake: making the child repeat the whole long sentence back (memory drill); correcting word order mid-flow; adding all the details yourself — let the child own each piece
  • Limited space: entirely verbal — narrate anything in sight (“a bird → a little bird → a little bird sits on the fence → …because it’s resting”); perfect for queues and car seats
  • Cross-domain: vocabulary (richer adjectives and adverbs supply the stretch material); narrative (multi-clause sentences are the building blocks of stories); memory (holding the growing sentence); literacy (oral complex syntax feeds later writing)
  • Progression: add one adjective → add a place or manner → add a “when” → add a “because/so” clause → combine two short sentences into one

Sources

  • Brown, R. (1973). A First Language: The Early Stages. Harvard University Press — MLU as the principal index of grammatical development
  • Rice, M. L., Smolik, F., Perpich, D., Thompson, T., Rytting, N. & Blossom, M. (2010). “Mean length of utterance levels in 6-month intervals for children 3 to 9 years with and without language impairments.” Journal of Speech, Language, and Hearing Research, 53(2), 333–349 — MLU norms (≈4.9 morphemes at age 5)
  • Eisenberg, S. L. (2013). “Grammar intervention: content and procedures for facilitating children’s language development.” Topics in Language Disorders, 33(2) — the sequence from sentence constituents to complex sentences
  • Eisenberg, S. L. (2014). “Sentence combining: assessment and intervention applications.” Perspectives on Language Learning and Education, 16(1)
  • Cleave, P. L., Becker, S. D., Curran, M. K., Owen Van Horne, A. J. & Fey, M. E. (2015). “The efficacy of recasts in language intervention: a systematic review and meta-analysis.” American Journal of Speech-Language Pathology, 24(2), 237–255 — evidence for modelling richer syntax via recast/expansion
  • ASHA — Communication Milestones: 4 to 5 Years (sentences are longer and more complex; uses “and” to connect ideas)
  • UK EYFS — Communication & Language, Speaking ELG (express ideas using full sentences and conjunctions, with modelling and support)
  • Head Start ELOF — Language & Communication, Goal P-LC 5 (expresses self in increasingly long, detailed, and sophisticated ways)