---
title: Identify the principal reason for which cleaning products must never… — Smells that warn · tree and pragmatics
description: Identify the principal reason for which cleaning products must never be mixed together. Exam question 4 of lesson 13 «Smells that warn» of the everyday 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 4 · Smells that warn

<!-- .ven lang=en -->
Identify the principal reason for which cleaning products must never be mixed together.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you · **What happens:** identify, not mix · **To what, where:** principal reason, cleaning products

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This is exam question 4 of lesson 13 «Smells that warn» of the everyday 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/everyday/13-smells-that-warn/#e4).

## The question {#question}

```conllu
# sent_id = question:everyday:13-smells-that-warn:e4:1
# text = Identify the principal reason for which cleaning products must never be mixed together.
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	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	12	obl	_	_
7	cleaning	cleaning	NOUN	NN	Number=Sing	8	compound	_	_
8	products	product	NOUN	NNS	Number=Plur	12	nsubj:pass	_	_
9	must	must	AUX	MD	VerbForm=Fin	12	aux	_	_
10	never	never	ADV	RB	PronType=Neg	12	advmod	_	_
11	be	be	AUX	VB	VerbForm=Inf	12	aux:pass	_	_
12	mixed	mix	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl:relcl	_	_
13	together	together	ADV	RB	_	12	advmod	_	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 principal reason |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent reason=Theme |
| 2 | **not** **mix** | must · passive |  | cleaning products |  |  |  | for the principal reason; together *property* | vn preparing-26.3-1 «NP V NP PP.beneficiary»: subject=Product for which=Beneficiary |

<!-- .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 containers are rendered unfit for recycling

```conllu
# sent_id = question:everyday:13-smells-that-warn:e4:o1:1
# text = The containers are rendered unfit for recycling
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	containers	container	NOUN	NNS	Number=Plur	4	nsubj:pass	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	rendered	render	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	unfit	unfit	ADJ	JJ	Degree=Pos	4	xcomp	_	_
6	for	for	ADP	IN	_	7	case	_	_
7	recycling	recycling	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **render** | present · passive |  | the containers |  |  |  | for recycling; unfit *property* | vn give-13.1 «NP V NP»: subject=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
The mixture becomes excessively sticky

```conllu
# sent_id = question:everyday:13-smells-that-warn:e4:o2:1
# text = The mixture becomes excessively sticky
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	mixture	mixture	NOUN	NN	Number=Sing	3	nsubj	_	_
3	becomes	become	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	excessively	excessively	ADV	RB	_	5	advmod	_	_
5	sticky	sticky	ADJ	JJ	Degree=Pos	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **become** | present | the mixture |  |  |  |  | sticky *property* | vn become-109.1-1-1 «NP V PP.attribute»: agent=Patient |

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

<!-- .ven lang=en -->
Certain mixtures give off a poisonous gas

```conllu
# sent_id = question:everyday:13-smells-that-warn:e4:o3:1
# text = Certain mixtures give off a poisonous gas
1	Certain	certain	ADJ	JJ	Degree=Pos	2	amod	_	_
2	mixtures	mixture	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	give	give	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	off	off	ADP	RP	_	3	compound:prt	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	poisonous	poisonous	ADJ	JJ	Degree=Pos	7	amod	_	_
7	gas	gas	NOUN	NN	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **give off** | present | Certain mixtures | a poisonous gas |  |  |  |  | vn substance\_emission-43.4 «NP V NP»: agent=Source gas=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The mixture invariably ceases to clean

```conllu
# sent_id = question:everyday:13-smells-that-warn:e4:o4:1
# text = The mixture invariably ceases to clean
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	mixture	mixture	NOUN	NN	Number=Sing	4	nsubj	_	_
3	invariably	invariably	ADV	RB	_	4	advmod	_	_
4	ceases	cease	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	clean	clean	VERB	VB	VerbForm=Inf	4	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cease** | present | the mixture |  |  |  |  | invariably *property* | vn stop-55.4-1-1 «NP V S\_ING»: agent=Affector clause=Eventuality |
| 2 | **clean** | to-infinitive | the mixture *not said here* |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |

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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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