---
title: Identify the process by which pure water may be obtained from salt w… — Mixtures and how to separate them · tree and pragmatics
description: Identify the process by which pure water may be obtained from salt water. Exam question 3 of lesson 19 «Mixtures and how to separate them» 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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# Exam question 3 · Mixtures and how to separate them

<!-- .ven lang=en -->
Identify the process by which pure water may be obtained from salt water.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** you, process · **What happens:** identify, obtain · **To what, where:** process, pure water, salt water

<!-- .vabout -->
This is exam question 3 of lesson 19 «Mixtures and how to separate them» of the world 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/world/19-mixtures-and-separating/#e3).

## The question {#question}

```conllu
# sent_id = question:world:19-mixtures-and-separating:e3:1
# text = Identify the process by which pure water may be obtained from salt water.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	process	process	NOUN	NN	Number=Sing	1	obj	_	_
4	by	by	ADP	IN	_	5	case	_	_
5	which	which	PRON	WDT	PronType=Rel	10	obl	_	_
6	pure	pure	ADJ	JJ	Degree=Pos	7	amod	_	_
7	water	water	NOUN	NN	Number=Sing	10	nsubj:pass	_	_
8	may	may	AUX	MD	VerbForm=Fin	10	aux	_	_
9	be	be	AUX	VB	VerbForm=Inf	10	aux:pass	_	_
10	obtained	obtain	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl:relcl	_	_
11	from	from	ADP	IN	_	13	case	_	_
12	salt	salt	NOUN	NN	Number=Sing	13	compound	_	_
13	water	water	NOUN	NN	Number=Sing	10	obl	_	SpaceAfter=No
14	.	.	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 process |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent process=Theme |
| 2 | **obtain** | may · passive | the process | pure water |  | salt water |  |  | vn obtain-13.5.2-1 «NP V NP PP.source»: agent=Agent subject=Theme from water=Source |

<!-- .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 -->
Sieving through a fine mesh

```conllu
# sent_id = question:world:19-mixtures-and-separating:e3:o1:1
# text = Sieving through a fine mesh
1	Sieving	sieve	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
2	through	through	ADP	IN	_	5	case	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	fine	fine	ADJ	JJ	Degree=Pos	5	amod	_	_
5	mesh	mesh	NOUN	NN	Number=Sing	1	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **sieve** | gerund |  |  |  | a fine mesh |  |  | vn disassemble-23.3 «NP V ADV-Middle»: agent=Patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
Separation by means of a magnet

```conllu
# sent_id = question:world:19-mixtures-and-separating:e3:o2:1
# text = Separation by means of a magnet
1	Separation	separation	NOUN	NN	Number=Sing	3	nsubj	_	_
2	by	by	ADP	IN	_	1	fixed	_	_
3	means	mean	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	of	of	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	magnet	magnet	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **mean** | present | Separation |  |  |  |  | of a magnet | vn intend-61.2-1 «NP V S»: agent=Agent |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
Distillation, the vapour being collected and condensed

```conllu
# sent_id = question:world:19-mixtures-and-separating:e3:o3:1
# text = Distillation, the vapour being collected and condensed
1	Distillation	distillation	NOUN	NN	Number=Sing	6	nsubj:pass	_	SpaceAfter=No
2	,	,	PUNCT	,	_	1	punct	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	vapour	vapour	NOUN	NN	Number=Sing	6	nsubj:pass	_	_
5	being	be	AUX	VBG	Tense=Pres|VerbForm=Part	6	aux:pass	_	_
6	collected	collect	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	condensed	condense	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	6	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **collect** | gerund · passive |  | Distillation |  |  |  |  | vn obtain-13.5.2 «NP V NP»: subject=Theme |
| 2 | **condense** | participle |  |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
Filtration through fine paper

```conllu
# sent_id = question:world:19-mixtures-and-separating:e3:o4:1
# text = Filtration through fine paper
1	Filtration	filtration	NOUN	NN	Number=Sing	0	root	_	_
2	through	through	ADP	IN	_	4	case	_	_
3	fine	fine	ADJ	JJ	Degree=Pos	4	amod	_	_
4	paper	paper	NOUN	NN	Number=Sing	1	nmod	_	_
```

<!-- .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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- ← previous: [Mixtures and how to separate them, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/world/19-mixtures-and-separating/e2/)
- next →: [Mixtures and how to separate them, exam 4](https://md.mova.elamur.ai/free/en/corpora/questions/world/19-mixtures-and-separating/e4/)
- ↑ back to [Mixtures and how to separate them](https://md.mova.elamur.ai/free/en/corpora/questions/world/19-mixtures-and-separating/)