---
title: When sound hits a large hard surface, such as a cliff or a wall of a… — Sound — vibrations, loudness, pitch and echoes · tree and pragmatics
description: When sound hits a large hard surface, such as a cliff or a wall of an empty hall, it bounces back. Who acts: sound. A sentence of the lesson «Sound — vibrations, loudness, pitch and echoes» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Sound — vibrations, loudness, pitch and echoes, sentence 7

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When sound hits a large hard surface, such as a cliff or a wall of an empty hall, it bounces back.

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**Who acts:** sound · **What happens:** hit, bounce back · **To what, where:** large hard surface

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This is a sentence of the lesson «Sound — vibrations, loudness, pitch and echoes» of the world 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 (sound), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:054-sound.lesson:7
# text = When sound hits a large hard surface, such as a cliff or a wall of an empty hall, it bounces back.
# source = school lesson (ours)
# course = world
# lesson = 054-sound.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): no change
1	When	when	SCONJ	WRB	_	2	mark	_	_
2	sound	sound	NOUN	NN	Number=Sing	3	nsubj	_	_
3	hits	hit	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	22	advcl	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
5	large	large	ADJ	JJ	Degree=Pos	7	amod	_	_
6	hard	hard	ADJ	JJ	Degree=Pos	7	amod	_	_
7	surface	surface	NOUN	NN	Number=Sing	3	obj	_	_
8	,	,	PUNCT	,	_	7	punct	_	_
9	such	such	ADJ	JJ	Degree=Pos|ExtPos=ADP	12	case	_	_
10	as	as	ADP	IN	_	9	fixed	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
12	cliff	cliff	NOUN	NN	Number=Sing	7	nmod	_	_
13	or	or	CCONJ	CC	_	15	cc	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
15	wall	wall	NOUN	NN	Number=Sing	12	conj	_	_
16	of	of	ADP	IN	_	19	case	_	_
17	an	a	DET	DT	Definite=Ind|PronType=Art	19	det	_	_
18	empty	empty	ADJ	JJ	Degree=Pos	19	amod	_	_
19	hall	hall	NOUN	NN	Number=Sing	15	nmod	_	_
20	,	,	PUNCT	,	_	22	punct	_	_
21	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	22	nsubj	_	_
22	bounces	bounce	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
23	back	back	ADV	RB	_	22	advmod	_	_
24	.	.	PUNCT	.	_	22	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hit** | present | sound | a large hard surface |  |  |  | such a cliff or a wall of a empty hall | vn contiguous\_location-47.8-1 «NP V NP»: agent=Theme surface=Co-Theme |
| 2 | **bounce back** | present | sound |  |  |  |  |  | vn run-51.3.2-2 «NP V»: agent=Theme |

<!-- .note -->
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.

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**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:world:054-sound.lesson:7`.

**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): no change. **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/).

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