--- title: When an ambulance races towards you its sound waves are squashed tog… — Thunder, sirens and how fast sound travels · tree and pragmatics description: When an ambulance races towards you its sound waves are squashed together and the siren sounds higher; as it drives away they are stretched out and it sounds lower. Who acts: ambulance, siren. A sentence of the lesson «Thunder, sirens and how fast sound travels» of the physics course of Mova's prima --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/3/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / [Thunder, sirens and how fast sound tra…](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/) / 3 # Thunder, sirens and how fast sound travels, sentence 3 When an ambulance races towards you its sound waves are squashed together and the siren sounds higher; as it drives away they are stretched out and it sounds lower. **Who acts:** ambulance, siren · **What happens:** race, squash, sound, drive away, stretch out, wave · **To what, where:** sound waves, waves This is a sentence of the lesson «Thunder, sirens and how fast sound travels» of the physics course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (ambulance, siren), what happens, when and where, as Mova's frames read it from the tree. ## The tree {#tree} ```conllu # sent_id = school:physics:018-thunder-sirens-and-how-fast-sound-travels.lesson:3 # text = When an ambulance races towards you its sound waves are squashed together and the siren sounds higher; as it drives away they are stretched out and it sounds lower. # source = school lesson (ours) # course = physics # lesson = 018-thunder-sirens-and-how-fast-sound-travels.lesson # annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R6-punct-agree ×1, R7-rel-agree ×2 1 When when SCONJ WRB _ 4 mark _ _ 2 an a DET DT Definite=Ind|PronType=Art 3 det _ _ 3 ambulance ambulance NOUN NN Number=Sing 4 nsubj _ _ 4 races race VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 11 advcl _ _ 5 towards towards ADP IN _ 6 case _ _ 6 you you PRON PRP Case=Acc|Person=2|PronType=Prs 4 obl _ _ 7 its its PRON PRP$ Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs 9 nmod:poss _ _ 8 sound sound NOUN NN Number=Sing 9 compound _ Agree=R7-rel-agree|Haiku=9:amod|HaikuPos=ADJ:JJ:Degree=Pos 9 waves wave NOUN NNS Number=Plur 11 nsubj:pass _ _ 10 are be AUX VBP Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin 11 aux:pass _ _ 11 squashed squash VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 0 root _ _ 12 together together ADV RB _ 11 advmod _ _ 13 and and CCONJ CC _ 16 cc _ _ 14 the the DET DT Definite=Def|PronType=Art 15 det _ _ 15 siren siren NOUN NN Number=Sing 16 nsubj _ _ 16 sounds sound VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 11 conj _ _ 17 higher high ADJ JJR Degree=Cmp 16 xcomp _ Agree=R7-rel-agree|Haiku=16:advmod|HaikuPos=ADV:RB:_ 18 ; ; PUNCT , _ 21 punct _ _ 19 as as SCONJ IN _ 21 mark _ _ 20 it it PRON PRP Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs 21 nsubj _ _ 21 drives drive VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 25 advcl _ _ 22 away away ADV RB _ 21 advmod _ _ 23 they they PRON PRP Case=Nom|Number=Plur|Person=3|PronType=Prs 25 nsubj:pass _ _ 24 are be AUX VBP Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin 25 aux:pass _ _ 25 stretched stretch VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 11 conj _ _ 26 out out ADP RP _ 25 compound:prt _ _ 27 and and CCONJ CC _ 29 cc _ _ 28 it it PRON PRP Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs 29 nsubj _ _ 29 sounds sound VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 25 conj _ _ 30 lower low ADJ JJR Degree=Cmp 29 xcomp _ _ 31 . . PUNCT . _ 11 punct _ Agree=R6-punct-agree|Haiku=25:punct ``` ## Pragmatics {#pragmatics} - form: statement - act: assert - voice: narrator - polarity: none - teacher: kept the draft | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **race** | present | a ambulance | | | | | towards you | vn run-51.3.2-2 «NP V PP.location»: agent=Theme towards you=Destination | | 2 | **squash** | present · passive | | ambulance's sound waves | | | | together *property* | vn carve-21.2-1 «NP V NP»: subject=Patient | | 3 | **sound** | present | the siren | | | | | high *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus | | 4 | **drive away** | present | siren | | | | | away *property* | vn nonvehicle-51.4.2-1 «NP V PP»: agent=Theme | | 5 | **stretch out** | present · passive | | waves *= wave* | | | | | vn bend-45.2 «NP V NP.patient»: subject=Patient | | 6 | **sound** | present | siren | | | | | low *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus | | 7 | **wave** | | ambulance | | | | | | nom wave «event transitive»: poss=agent | One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree. **Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:physics:018-thunder-sirens-and-how-fast-sound-travels.lesson:3`. **The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R6-punct-agree ×1, R7-rel-agree ×2. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence. See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/). - ← previous: [Thunder, sirens and how fast sound tra…, 2](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/2/) - next →: [Thunder, sirens and how fast sound tra…, 4](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/4/) - ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/)