---
title: State the approximate proportion of the air composed of oxygen. — Air and why we need it · tree and pragmatics
description: State the approximate proportion of the air composed of oxygen. Exam question 1 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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# Exam question 1 · Air and why we need it

<!-- .ven lang=en -->
State the approximate proportion of the air composed of oxygen.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **What happens:** compose · **To what, where:** air

<!-- .vabout -->
This is exam question 1 of lesson 17 «Air and why we need it» of the world course of Mova's primary school, asked in stiff, formal language. 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/#e1).

## The question {#question}

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:e1:1
# text = State the approximate proportion of the air composed of oxygen.
1	State	state	NOUN	NN	Number=Sing	4	compound	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	approximate	approximate	ADJ	JJ	Degree=Pos	4	amod	_	_
4	proportion	proportion	NOUN	NN	Number=Sing	0	root	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	air	air	NOUN	NN	Number=Sing	4	nmod	_	_
8	composed	compose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	acl	_	_
9	of	of	ADP	IN	_	10	case	_	_
10	oxygen	oxygen	NOUN	NN	Number=Sing	8	obl	_	SpaceAfter=No
11	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **compose** | participle |  | the air *not said here* |  |  |  | of oxygen | vn create-26.4-1 «NP V»: agent=Agent |

<!-- .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 -->
Four fifths

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:e1:o1:1
# text = Four fifths
1	Four	four	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	fifths	fifth	NOUN	NNS	Number=Plur	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
One hundredth

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:e1:o2:1
# text = One hundredth
1	One	one	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	hundredth	hundredth	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
One fifth

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:e1:o3:1
# text = One fifth
1	One	one	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	fifth	fifth	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
One half

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:e1:o4:1
# text = One half
1	One	one	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	half	half	NOUN	NN	Number=Sing|NumForm=Word|NumType=Frac	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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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 13](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t13/)
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