---
title: Why is it hard to run fast near the top of a very high mountain? — Air and why we need it · tree and pragmatics
description: Why is it hard to run fast near the top of a very high mountain? Test 4 · ★ of lesson 17 «Air and why we need it» of the world 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 4 · ★ · Air and why we need it

<!-- .ven lang=en -->
Why is it hard to run fast near the top of a very high mountain?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **What happens:** be, run · **To what, where:** top

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This is test 4 · ★ of lesson 17 «Air and why we need it» of the world 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/world/17-air-oxygen-carbon-dioxide/#t4).

## The question {#question}

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t4:1
# text = Why is it hard to run fast near the top of a very high mountain?
1	Why	why	ADV	WRB	PronType=Int	4	advmod	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	expl	_	_
4	hard	hard	ADJ	JJ	Degree=Pos	0	root	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	run	run	VERB	VB	VerbForm=Inf	4	xcomp	_	_
7	fast	fast	ADV	RB	Degree=Pos	6	advmod	_	_
8	near	near	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	top	top	NOUN	NN	Number=Sing	6	obl	_	_
11	of	of	ADP	IN	_	15	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
13	very	very	ADV	RB	_	14	advmod	_	_
14	high	high	ADJ	JJ	Degree=Pos	15	amod	_	_
15	mountain	mountain	NOUN	NN	Number=Sing	10	nmod	_	SpaceAfter=No
16	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present |  |  |  |  |  | hard *property* | tree rules |
| 2 | **run** | to-infinitive |  |  |  | the top of a high mountain |  | fast *property* | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme near top=Trajectory |

<!-- .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 -->
Gravity is much stronger up there

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t4:o1:1
# text = Gravity is much stronger up there
1	Gravity	gravity	NOUN	NN	Number=Sing	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	much	much	ADV	RB	_	4	advmod	_	_
4	stronger	strong	ADJ	JJR	Degree=Cmp	0	root	_	_
5	up	up	ADV	RB	_	4	advmod	_	_
6	there	there	ADV	RB	PronType=Dem	4	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Gravity |  |  | there |  | strong *property* | tree rules |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Each breath brings in less oxygen

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t4:o2:1
# text = Each breath brings in less oxygen
1	Each	each	DET	DT	PronType=Tot	2	det	_	_
2	breath	breath	NOUN	NN	Number=Sing	3	nsubj	_	_
3	brings	bring	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	in	in	ADP	IN	_	6	case	_	_
5	less	less	ADJ	JJR	Degree=Cmp	6	amod	_	_
6	oxygen	oxygen	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **bring** | present | each breath |  |  | less oxygen |  |  | vn bring-11.3-1 «NP V NP together»: agent=Agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
The ground is softer up there

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t4:o3:1
# text = The ground is softer up there
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	ground	ground	NOUN	NN	Number=Sing	4	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	softer	soft	ADJ	JJR	Degree=Cmp	0	root	_	_
5	up	up	ADV	RB	_	6	advmod	_	_
6	there	there	ADV	RB	PronType=Dem	4	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the ground |  |  | there |  | soft *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
The air is too heavy to breathe

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t4:o4:1
# text = The air is too heavy to breathe
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	air	air	NOUN	NN	Number=Sing	5	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	too	too	ADV	RB	_	5	advmod	_	_
5	heavy	heavy	ADJ	JJ	Degree=Pos	0	root	_	_
6	to	to	PART	TO	_	7	mark	_	_
7	breathe	breathe	VERB	VB	VerbForm=Inf	5	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the air |  |  |  |  | heavy *property* | tree rules |
| 2 | **breathe** | to-infinitive | the air *not said here* |  |  |  |  |  | vn breathe-40.1.2-1 «NP V»: agent=Agent |

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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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- ← previous: [Air and why we need it, test 3](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t3/)
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