---
title: Why do concert halls have special shapes and soft materials? — What sound is: wobbles in the air · tree and pragmatics
description: Why do concert halls have special shapes and soft materials? Test 6 of lesson 17 «What sound is: wobbles in the air» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 6 · What sound is: wobbles in the air

<!-- .ven lang=en -->
Why do concert halls have special shapes and soft materials?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** concert halls · **What happens:** have · **To what, where:** special shapes

<!-- .vabout -->
This is test 6 of lesson 17 «What sound is: wobbles in the air» of the physics course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/physics/17-what-sound-is-wobbles-in-the-air/#t6).

## The question {#question}

```conllu
# sent_id = question:physics:17-what-sound-is-wobbles-in-the-air:t6:1
# text = Why do concert halls have special shapes and soft materials?
1	Why	why	ADV	WRB	PronType=Int	5	advmod	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	aux	_	_
3	concert	concert	NOUN	NN	Number=Sing	4	compound	_	_
4	halls	hall	NOUN	NNS	Number=Plur	5	nsubj	_	_
5	have	have	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	_	_
6	special	special	ADJ	JJ	Degree=Pos	7	amod	_	_
7	shapes	shape	NOUN	NNS	Number=Plur	5	obj	_	_
8	and	and	CCONJ	CC	_	10	cc	_	_
9	soft	soft	ADJ	JJ	Degree=Pos	10	amod	_	_
10	materials	material	NOUN	NNS	Number=Plur	7	conj	_	SpaceAfter=No
11	?	?	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present · do-support | concert halls | special shapes and soft materials |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent shape=Patient |

<!-- .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.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
To make the hall look bigger

```conllu
# sent_id = question:physics:17-what-sound-is-wobbles-in-the-air:t6:o1:1
# text = To make the hall look bigger
1	To	to	PART	TO	_	2	mark	_	_
2	make	make	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	hall	hall	NOUN	NN	Number=Sing	2	obj	_	_
5	look	look	VERB	VB	VerbForm=Inf	2	xcomp	_	_
6	bigger	big	ADJ	JJR	Degree=Cmp	5	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | to-infinitive |  | the hall |  |  |  |  | tree rules |
| 2 | **look** | infinitive | the hall *not said here* |  |  |  |  | big *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |

### Option 2 {#o2}

<!-- .ven lang=en -->
To stop the sound reaching the audience

```conllu
# sent_id = question:physics:17-what-sound-is-wobbles-in-the-air:t6:o2:1
# text = To stop the sound reaching the audience
1	To	to	PART	TO	_	2	mark	_	_
2	stop	stop	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	sound	sound	NOUN	NN	Number=Sing	2	obj	_	_
5	reaching	reach	VERB	VBG	VerbForm=Ger	2	xcomp	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	audience	audience	NOUN	NN	Number=Sing	5	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **stop** | to-infinitive |  | the sound |  |  |  |  | tree rules |
| 2 | **reach** | gerund |  | the audience |  |  |  |  | vn body\_motion-49.2-1-1 «NP V NP ADV»: agent=Agent audience=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
To keep the musicians warm

```conllu
# sent_id = question:physics:17-what-sound-is-wobbles-in-the-air:t6:o3:1
# text = To keep the musicians warm
1	To	to	PART	TO	_	2	mark	_	_
2	keep	keep	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	musicians	musician	NOUN	NNS	Number=Plur	2	obj	_	_
5	warm	warm	ADJ	JJ	Degree=Pos	2	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **keep** | to-infinitive |  | the musicians |  |  |  | warm *property* | vn keep-15.2 «NP V NP»: agent=Agent musician=Theme |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
To control how sound bounces so the music sounds right

```conllu
# sent_id = question:physics:17-what-sound-is-wobbles-in-the-air:t6:o4:1
# text = To control how sound bounces so the music sounds right
1	To	to	PART	TO	_	2	mark	_	_
2	control	control	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	how	how	ADV	WRB	PronType=Int	4	advmod	_	_
4	sound	sound	ADJ	JJ	Degree=Pos	5	nsubj	_	_
5	bounces	bounce	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	ccomp	_	_
6	so	so	SCONJ	IN	_	9	mark	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	music	music	NOUN	NN	Number=Sing	9	nsubj	_	_
9	sounds	sound	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	_	_
10	right	right	ADJ	JJ	Degree=Pos	9	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **control** | to-infinitive |  |  |  |  |  |  | vn enforce-63 «NP V that S»: agent=Agent clause=Theme |
| 2 | **bounce** | present | sound |  |  |  |  |  | vn run-51.3.2-2 «NP V»: agent=Theme |
| 3 | **sound** | present | the music |  |  |  |  | right *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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