---
title: Why must a car engine have air coming in? — Air and why we need it · tree and pragmatics
description: Why must a car engine have air coming in? Test 7 · ★ 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 right.
---

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# Test 7 · ★ · Air and why we need it

<!-- .ven lang=en -->
Why must a car engine have air coming in?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **Who acts:** car engine · **What happens:** come in

<!-- .vabout -->
This is test 7 · ★ 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/#t7).

## The question {#question}

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t7:1
# text = Why must a car engine have air coming in?
1	Why	why	ADV	WRB	PronType=Int	8	advmod	_	_
2	must	must	AUX	MD	VerbForm=Fin	8	aux	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	car	car	NOUN	NN	Number=Sing	5	compound	_	_
5	engine	engine	NOUN	NN	Number=Sing	8	nsubj	_	_
6	have	have	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	aux	_	_
7	air	air	NOUN	NN	Number=Sing	8	nsubj	_	_
8	coming	come	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
9	in	in	ADV	RB	_	8	advmod	_	SpaceAfter=No
10	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **come in** | must | a car engine |  |  |  |  |  | vn escape-51.1-1 «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 {#o1}

<!-- .ven lang=en -->
The air keeps the seats nice and cool

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t7:o1:1
# text = The air keeps the seats nice and cool
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	air	air	NOUN	NN	Number=Sing	3	nsubj	_	_
3	keeps	keep	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	seats	seat	NOUN	NNS	Number=Plur	3	obj	_	_
6	nice	nice	ADJ	JJ	Degree=Pos	3	xcomp	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	cool	cool	ADJ	JJ	Degree=Pos	6	conj	_	_
```

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

### Option 2 {#o2}

<!-- .ven lang=en -->
The engine runs on nitrogen gas

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t7:o2:1
# text = The engine runs on nitrogen gas
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	engine	engine	NOUN	NN	Number=Sing	3	nsubj	_	_
3	runs	run	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	on	on	ADP	IN	_	6	case	_	_
5	nitrogen	nitrogen	NOUN	NN	Number=Sing	6	compound	_	_
6	gas	gas	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **run** | present | the engine |  |  | nitrogen gas |  |  | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme on gas=Trajectory |

### Option 3 {#o3}

<!-- .ven lang=en -->
Air is the only fuel that it ever uses

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t7:o3:1
# text = Air is the only fuel that it ever uses
1	Air	air	NOUN	NN	Number=Sing	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	only	only	ADJ	JJ	Degree=Pos	5	amod	_	_
5	fuel	fuel	NOUN	NN	Number=Sing	0	root	_	_
6	that	that	SCONJ	IN	_	9	mark	_	_
7	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
8	ever	ever	ADV	RB	PronType=Ind	9	advmod	_	_
9	uses	use	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Air | the only fuel |  |  |  |  | tree rules |
| 2 | **use** | present | Air |  |  |  | ever |  | vn eat-39.1 «NP V»: agent=Agent |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
The fuel needs oxygen to burn

```conllu
# sent_id = question:world:17-air-oxygen-carbon-dioxide:t7:o4:1
# text = The fuel needs oxygen to burn
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	fuel	fuel	NOUN	NN	Number=Sing	3	nsubj	_	_
3	needs	need	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	oxygen	oxygen	NOUN	NN	Number=Sing	3	obj	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	burn	burn	VERB	VB	VerbForm=Inf	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **need** | present | the fuel | oxygen |  |  |  |  | tree rules |
| 2 | **burn** *not said to happen* | to-infinitive | oxygen *not said here* |  |  |  |  |  | vn light\_emission-43.1 «NP V»: agent=Theme |

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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 6](https://md.mova.elamur.ai/free/en/corpora/questions/world/17-air-oxygen-carbon-dioxide/t6/)
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