---
title: Identify the principal process by which energy is generated within t… — Stars: what they are · tree and pragmatics
description: Identify the principal process by which energy is generated within the core of the Sun. Exam question 1 of lesson 17 «Stars: what they are» of the space 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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# Exam question 1 · Stars: what they are

<!-- .ven lang=en -->
Identify the principal process by which energy is generated within the core of the Sun.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you, principal process · **What happens:** identify, generate · **To what, where:** principal process, energy

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This is exam question 1 of lesson 17 «Stars: what they are» of the space 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/space/17-stars-what-they-are/#e1).

## The question {#question}

```conllu
# sent_id = question:space:17-stars-what-they-are:e1:1
# text = Identify the principal process by which energy is generated within the core of the Sun.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	process	process	NOUN	NN	Number=Sing	1	obj	_	_
5	by	by	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	9	obl	_	_
7	energy	energy	NOUN	NN	Number=Sing	9	nsubj:pass	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	aux:pass	_	_
9	generated	generate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl:relcl	_	_
10	within	within	ADP	IN	_	12	case	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
12	core	core	NOUN	NN	Number=Sing	9	obl	_	_
13	of	of	ADP	IN	_	15	case	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	Sun.	Sunday	PROPN	NNP	Number=Sing	12	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal process |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent process=Theme |
| 2 | **generate** | present · passive | the principal process | energy |  |  |  | within the core of the Sun. | vn birth-28.2-1 «NP V NP»: agent=Agent subject=Patient |

<!-- .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 reflection of starlight

```conllu
# sent_id = question:space:17-stars-what-they-are:e1:o1:1
# text = The reflection of starlight
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	reflection	reflection	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	starlight	starlight	NOUN	NN	Number=Sing	2	nmod	_	_
```

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

### Option 2 {#o2}

<!-- .ven lang=en -->
The eruption of volcanoes

```conllu
# sent_id = question:space:17-stars-what-they-are:e1:o2:1
# text = The eruption of volcanoes
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	eruption	eruption	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	volcanoes	volcano	NOUN	NNS	Number=Plur	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **erupt** |  | volcanoes |  |  |  |  |  | nom eruption «event intransitive»: of=agent |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The fusion of hydrogen nuclei to form helium

```conllu
# sent_id = question:space:17-stars-what-they-are:e1:o3:1
# text = The fusion of hydrogen nuclei to form helium
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	fusion	fusion	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	hydrogen	hydrogen	NOUN	NN	Number=Sing	5	compound	_	_
5	nuclei	nucleus	NOUN	NNS	Number=Plur	2	nmod	_	_
6	to	to	PART	TO	_	7	mark	_	_
7	form	form	VERB	VB	VerbForm=Inf	2	acl	_	_
8	helium	helium	NOUN	NN	Number=Sing	7	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **form** | to-infinitive |  | helium |  |  |  |  | vn appear-48.1.1 «PP.location V NP»: agent=Location helium=Theme |
| 2 | **fuse** |  | hydrogen nuclei |  |  |  |  |  | nom fusion «event intransitive»: of=agent |

### Option 4 {#o4}

<!-- .ven lang=en -->
The combustion of coal and other fuels in its core

```conllu
# sent_id = question:space:17-stars-what-they-are:e1:o4:1
# text = The combustion of coal and other fuels in its core
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	combustion	combustion	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	coal	coal	NOUN	NN	Number=Sing	2	nmod	_	_
5	and	and	CCONJ	CC	_	7	cc	_	_
6	other	other	ADJ	JJ	Degree=Pos	7	amod	_	_
7	fuels	fuel	NOUN	NNS	Number=Plur	2	conj	_	_
8	in	in	ADP	IN	_	10	case	_	_
9	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	10	nmod:poss	_	_
10	core	core	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **combust** |  | coal |  |  | coal's core |  |  | nom combustion «process intransitive»: of=agent in=place |

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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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