---
title: Identify the three requisites for the sustenance of combustion. — Fuels, the Sun and saving energy · tree and pragmatics
description: Identify the three requisites for the sustenance of combustion. Exam question 1 of lesson 32 «Fuels, the Sun and saving energy» 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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# Exam question 1 · Fuels, the Sun and saving energy

<!-- .ven lang=en -->
Identify the three requisites for the sustenance of combustion.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you · **What happens:** identify · **To what, where:** three requisites

<!-- .vabout -->
This is exam question 1 of lesson 32 «Fuels, the Sun and saving energy» of the physics 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/physics/32-fuels-the-sun-and-saving-energy/#e1).

## The question {#question}

```conllu
# sent_id = question:physics:32-fuels-the-sun-and-saving-energy:e1:1
# text = Identify the three requisites for the sustenance of combustion.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	three	three	NUM	CD	NumForm=Word|NumType=Card	4	nummod	_	_
4	requisites	requisite	NOUN	NNS	Number=Plur	1	obj	_	_
5	for	for	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	sustenance	sustenance	NOUN	NN	Number=Sing	1	obl	_	_
8	of	of	ADP	IN	_	9	case	_	_
9	combustion	combustion	NOUN	NN	Number=Sing	7	nmod	_	SpaceAfter=No
10	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the three requisites |  |  |  | for the sustenance of combustion | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent requisite=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 -->
Smoke, ash and sparks

```conllu
# sent_id = question:physics:32-fuels-the-sun-and-saving-energy:e1:o1:1
# text = Smoke, ash and sparks
1	Smoke	smoke	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	ash	ash	NOUN	NN	Number=Sing	1	conj	_	_
4	and	and	CCONJ	CC	_	5	cc	_	_
5	sparks	spark	NOUN	NNS	Number=Plur	1	conj	_	_
```

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

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

<!-- .ven lang=en -->
Fuel, oxygen and heat

```conllu
# sent_id = question:physics:32-fuels-the-sun-and-saving-energy:e1:o2:1
# text = Fuel, oxygen and heat
1	Fuel	fuel	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	oxygen	oxygen	NOUN	NN	Number=Sing	1	conj	_	_
4	and	and	CCONJ	CC	_	5	cc	_	_
5	heat	heat	NOUN	NN	Number=Sing	1	conj	_	_
```

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

### Option 3 {#o3}

<!-- .ven lang=en -->
Water, wind and light

```conllu
# sent_id = question:physics:32-fuels-the-sun-and-saving-energy:e1:o3:1
# text = Water, wind and light
1	Water	water	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	wind	wind	NOUN	NN	Number=Sing	1	conj	_	_
4	and	and	CCONJ	CC	_	5	cc	_	_
5	light	light	NOUN	NN	Number=Sing	1	conj	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
Electricity, metal and air

```conllu
# sent_id = question:physics:32-fuels-the-sun-and-saving-energy:e1:o4:1
# text = Electricity, metal and air
1	Electricity	electricity	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
2	,	,	PUNCT	,	_	3	punct	_	_
3	metal	metal	NOUN	NN	Number=Sing	1	conj	_	_
4	and	and	CCONJ	CC	_	5	cc	_	_
5	air	air	NOUN	NN	Number=Sing	1	conj	_	_
```

<!-- .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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