---
title: If all green plants disappeared, what would slowly happen to the air? — Air and why we need it · tree and pragmatics
description: If all green plants disappeared, what would slowly happen to the air? Test 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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# Test 1 · ★ · Air and why we need it

<!-- .ven lang=en -->
If all green plants disappeared, what would slowly happen to the air?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** green plants · **What happens:** disappear, happen

<!-- .vabout -->
This is test 1 · ★ 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/#t1).

## The question {#question}

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t1:1
# text = If all green plants disappeared, what would slowly happen to the air?
1	If	if	SCONJ	IN	_	5	mark	_	_
2	all	all	DET	DT	PronType=Tot	4	det	_	_
3	green	green	ADJ	JJ	Degree=Pos	4	amod	_	_
4	plants	plant	NOUN	NNS	Number=Plur	5	nsubj	_	_
5	disappeared	disappear	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	10	advcl	_	SpaceAfter=No
6	,	,	PUNCT	,	_	5	punct	_	_
7	what	what	PRON	WP	PronType=Int	10	nsubj	_	_
8	would	would	AUX	MD	VerbForm=Fin	10	aux	_	_
9	slowly	slowly	ADV	RB	_	10	advmod	_	_
10	happen	happen	VERB	VB	VerbForm=Inf	0	root	_	_
11	to	to	ADP	IN	_	13	case	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	13	det	_	_
13	air	air	NOUN	NN	Number=Sing	10	obl	_	SpaceAfter=No
14	?	?	PUNCT	.	_	10	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **disappear** *a condition, not said to happen* | past | all green plants |  |  |  |  |  | vn disappearance-48.2-1 «NP V»: agent=Theme |
| 2 | **happen** | would |  |  |  |  |  | to the air; slowly *property* | vn occur-48.3-1 «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.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
It would get more and more oxygen

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t1:o1:1
# text = It would get more and more oxygen
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	_	_
3	get	get	VERB	VB	VerbForm=Inf	0	root	_	_
4	more	more	ADJ	JJR	Degree=Cmp	7	amod	_	_
5	and	and	CCONJ	CC	_	6	cc	_	_
6	more	more	ADJ	JJR	Degree=Cmp	4	conj	_	_
7	oxygen	oxygen	NOUN	NN	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **get** | would | It | more oxygen |  |  |  |  | vn comprehend-87.2-1 «NP V NP»: agent=Experiencer oxygen=Stimulus |

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

<!-- .ven lang=en -->
Its oxygen would run low and its carbon dioxide would grow

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t1:o2:1
# text = Its oxygen would run low and its carbon dioxide would grow
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	oxygen	oxygen	NOUN	NN	Number=Sing	4	nsubj	_	_
3	would	would	AUX	MD	VerbForm=Fin	4	aux	_	_
4	run	run	VERB	VB	VerbForm=Inf	0	root	_	_
5	low	low	ADV	RB	Degree=Pos	4	advmod	_	_
6	and	and	CCONJ	CC	_	11	cc	_	_
7	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	9	nmod:poss	_	_
8	carbon	carbon	NOUN	NN	Number=Sing	9	compound	_	_
9	dioxide	dioxide	NOUN	NN	Number=Sing	11	nsubj	_	_
10	would	would	AUX	MD	VerbForm=Fin	11	aux	_	_
11	grow	grow	VERB	VB	VerbForm=Inf	4	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **run** | would | Its oxygen |  |  |  |  | low *property* | vn run-51.3.2-2-1 «NP V»: agent=Theme |
| 2 | **grow** | would | oxygen's carbon dioxide |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
Nothing, because animals make oxygen

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t1:o3:1
# text = Nothing, because animals make oxygen
1	Nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	5	punct	_	_
3	because	because	SCONJ	IN	_	5	mark	_	_
4	animals	animal	NOUN	NNS	Number=Plur	5	nsubj	_	_
5	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	1	parataxis	_	_
6	oxygen	oxygen	NOUN	NN	Number=Sing	5	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | animals | oxygen |  |  |  |  | vn build-26.1-1 «NP V NP»: agent=Agent oxygen=Product |

### Option 4 {#o4}

<!-- .ven lang=en -->
It would all turn into water vapour

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t1:o4:1
# text = It would all turn into water vapour
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	4	aux	_	_
3	all	all	ADV	RB	_	4	advmod	_	_
4	turn	turn	VERB	VB	VerbForm=Inf	0	root	_	_
5	into	into	ADP	IN	_	7	case	_	_
6	water	water	NOUN	NN	Number=Sing	7	compound	_	_
7	vapour	vapour	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | would | It |  |  | water vapour |  | all *property* | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme into vapour=Trajectory |

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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: [Climate zones, exam 4](https://md.mova.elamur.ai/free/en/corpora/questions/world/16-climate-zones/e4/)
- next →: [Air and why we need it, test 2](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t2/)
- ↑ back to [Air and why we need it](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/)