---
title: Ascertain the principal cause of the tides employed in tidal power s… — Wind, sun and other clean energy · tree and pragmatics
description: Ascertain the principal cause of the tides employed in tidal power stations. Exam question 3 of lesson 33 «Wind, sun and other clean energy» of the technology 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 3 · Wind, sun and other clean energy

<!-- .ven lang=en -->
Ascertain the principal cause of the tides employed in tidal power stations.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you, principal cause · **What happens:** ascertain, employ · **To what, where:** principal cause, tidal power stations

<!-- .vabout -->
This is exam question 3 of lesson 33 «Wind, sun and other clean energy» of the technology 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/technology/33-wind-sun-and-other-clean-energy/#e3).

## The question {#question}

```conllu
# sent_id = question:technology:33-wind-sun-and-other-clean-energy:e3:1
# text = Ascertain the principal cause of the tides employed in tidal power stations.
1	Ascertain	ascertain	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	cause	cause	NOUN	NN	Number=Sing	1	obj	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	tides	tide	NOUN	NNS	Number=Plur	8	obl	_	_
8	employed	employ	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	4	acl:relcl	_	_
9	in	in	ADP	IN	_	12	case	_	_
10	tidal	tidal	ADJ	JJ	Degree=Pos	12	amod	_	_
11	power	power	NOUN	NN	Number=Sing	12	compound	_	_
12	stations	station	NOUN	NNS	Number=Plur	8	obl	_	SpaceAfter=No
13	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the principal cause |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent cause=Topic |
| 2 | **employ** | past | the principal cause *not said here* |  |  | tidal power stations |  | of the tides | vn hire-13.5.3 «NP V NP»: 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 -->
The movement of large marine animals

```conllu
# sent_id = question:technology:33-wind-sun-and-other-clean-energy:e3:o1:1
# text = The movement of large marine animals
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	movement	movement	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	large	large	ADJ	JJ	Degree=Pos	6	amod	_	_
5	marine	marine	ADJ	JJ	Degree=Pos	6	amod	_	_
6	animals	animal	NOUN	NNS	Number=Plur	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **move** |  |  | large marine animals |  |  |  |  | nom movement «act transitive»: of=patient |

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

<!-- .ven lang=en -->
The gravitational attraction exerted by the Moon upon the oceans

```conllu
# sent_id = question:technology:33-wind-sun-and-other-clean-energy:e3:o2:1
# text = The gravitational attraction exerted by the Moon upon the oceans
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	gravitational	gravitational	ADJ	JJ	Degree=Pos	3	amod	_	_
3	attraction	attraction	NOUN	NN	Number=Sing	0	root	_	_
4	exerted	exert	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl	_	_
5	by	by	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	Moon	Moon	PROPN	NNP	Number=Sing	4	obl	_	_
8	upon	upon	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	oceans	ocean	NOUN	NNS	Number=Plur	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **exert** | participle |  | the gravitational attraction *not said here* |  |  |  | by the Moon; upon the oceans | vn use-105.1 «NP V NP»: agent=Agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
The discharge of rivers into the sea

```conllu
# sent_id = question:technology:33-wind-sun-and-other-clean-energy:e3:o3:1
# text = The discharge of rivers into the sea
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	discharge	discharge	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	rivers	river	NOUN	NNS	Number=Plur	2	nmod	_	_
5	into	into	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	sea	sea	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **discharge** |  |  | rivers |  | the sea |  |  | nom discharge «event transitive»: of=patient into=place |

### Option 4 {#o4}

<!-- .ven lang=en -->
The action of the wind blowing steadily upon the surface of the sea

```conllu
# sent_id = question:technology:33-wind-sun-and-other-clean-energy:e3:o4:1
# text = The action of the wind blowing steadily upon the surface of the sea
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	action	action	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	wind	wind	NOUN	NN	Number=Sing	2	nmod	_	_
6	blowing	blow	VERB	VBG	VerbForm=Ger	5	acl	_	_
7	steadily	steadily	ADV	RB	_	6	advmod	_	_
8	upon	upon	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	surface	surface	NOUN	NN	Number=Sing	6	obl	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	13	det	_	_
13	sea	sea	NOUN	NN	Number=Sing	10	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **blow** | gerund | the wind *not said here* |  |  |  |  | upon the surface of the sea; steadily *property* | vn split-23.2 «NP V apart»: agent=Patient |
| 2 | **act** |  | the wind |  |  |  |  |  | nom action «act intransitive»: of=agent |

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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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