---
title: "if atoms never get destroyed, why can't I glue my burnt homework ba… — Changes you can undo and changes you c… · tree and pragmatics
description: "if atoms never get destroyed, why can't I glue my burnt homework back together?" Best answer? Test 2 · ★ of lesson 9 «Changes you can undo and changes you can't» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choi
---

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# Test 2 · ★ · Changes you can undo and changes you can't

<!-- .ven lang=en -->
"if atoms never get destroyed, why can't I glue my burnt homework back together?" Best answer?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 2 · wrong ✗ · **Who acts:** I · **What happens:** not destroy, not glue · **To what, where:** atoms, burnt homework

<!-- .vabout -->
This is test 2 · ★ of lesson 9 «Changes you can undo and changes you can't» of the chemistry course of Mova's primary school. 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/chemistry/9-changes-you-can-and-cannot-undo/#t2).

## The question {#question}

<!-- .note -->
*Sentence 1:* "if atoms never get destroyed, why can't I glue my burnt homework back together?"

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:1
# text = "if atoms never get destroyed, why can't I glue my burnt homework back together?"
1	"	"	PUNCT	``	_	12	punct	_	SpaceAfter=No
2	if	if	SCONJ	IN	_	6	mark	_	_
3	atoms	atom	NOUN	NNS	Number=Plur	6	nsubj:pass	_	_
4	never	never	ADV	RB	PronType=Neg	6	advmod	_	_
5	get	get	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	aux:pass	_	_
6	destroyed	destroy	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	12	advcl	_	SpaceAfter=No
7	,	,	PUNCT	,	_	6	punct	_	_
8	why	why	ADV	WRB	PronType=Int	12	advmod	_	_
9	ca	can	AUX	MD	VerbForm=Fin	12	aux	_	SpaceAfter=No
10	n't	not	PART	RB	Polarity=Neg	12	advmod	_	_
11	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	12	nsubj	_	_
12	glue	glue	VERB	VB	VerbForm=Inf	0	root	_	_
13	my	my	PRON	PRP$	Case=Gen|Number=Sing|Person=1|Poss=Yes|PronType=Prs	15	nmod:poss	_	_
14	burnt	burnt	ADJ	JJ	Degree=Pos	15	amod	_	_
15	homework	homework	NOUN	NN	Number=Sing	12	obj	_	_
16	back	back	ADV	RB	_	12	advmod	_	_
17	together	together	ADV	RB	_	12	advmod	_	SpaceAfter=No
18	?	?	PUNCT	.	_	12	punct	_	SpaceAfter=No
19	"	"	PUNCT	''	_	12	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **destroy** *a condition, not said to happen, in a quote* | present · passive |  | atoms |  |  |  |  | vn destroy-44 «NP V NP»: subject=Patient |
| 2 | **not** **glue** *in a quote* | can | I | my burnt homework |  |  |  | together *property* | vn tape-22.4 «NP V NP»: agent=Agent homework=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.

<!-- .note -->
*Sentence 2:* Best answer?

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:2
# text = Best answer?
1	Best	good	ADJ	JJS	Degree=Sup	2	amod	_	_
2	answer	answer	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
3	?	?	PUNCT	.	_	2	punct	_	_
```

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

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The paper is hiding in the smoke

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:o1:1
# text = The paper is hiding in the smoke
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	paper	paper	NOUN	NN	Number=Sing	4	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
4	hiding	hide	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	smoke	smoke	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hide** | present · progressive | the paper |  |  | the smoke |  |  | vn concealment-16-1 «NP V PP.location»: agent=Agent in smoke=Location |

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

<!-- .ven lang=en -->
The atoms are now in new substances in the air and ash

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:o2:1
# text = The atoms are now in new substances in the air and ash
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	atoms	atom	NOUN	NNS	Number=Plur	7	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
4	now	now	ADV	RB	PronType=Dem	7	advmod	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	new	new	ADJ	JJ	Degree=Pos	7	amod	_	_
7	substances	substance	NOUN	NNS	Number=Plur	0	root	_	_
8	in	in	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	air	air	NOUN	NN	Number=Sing	7	nmod	_	_
11	and	and	CCONJ	CC	_	12	cc	_	_
12	ash	ash	NOUN	NN	Number=Sing	10	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the atoms |  |  | new substances | now | in the air and ash | tree rules |

### Option 3 {#o3}

<!-- .ven lang=en -->
You can, with strong enough glue

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:o3:1
# text = You can, with strong enough glue
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	2	nsubj	_	_
2	can	can	AUX	MD	VerbForm=Fin	0	root	_	SpaceAfter=No
3	,	,	PUNCT	,	_	7	punct	_	_
4	with	with	ADP	IN	_	7	case	_	_
5	strong	strong	ADJ	JJ	Degree=Pos	7	amod	_	_
6	enough	enough	ADJ	JJ	Degree=Pos	7	amod	_	_
7	glue	glue	NOUN	NN	Number=Sing	2	conj	_	_
```

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

### Option 4 · ← Mova's choice {#o4}

<!-- .ven lang=en -->
The atoms were all destroyed by the fire, so there is nothing left to glue

<!-- fold The tree, 15 words -->
```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:t2:o4:1
# text = The atoms were all destroyed by the fire, so there is nothing left to glue
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	atoms	atom	NOUN	NNS	Number=Plur	5	nsubj:pass	_	_
3	were	be	AUX	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	5	aux:pass	_	_
4	all	all	ADV	RB	_	5	advmod	_	_
5	destroyed	destroy	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
6	by	by	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	fire	fire	NOUN	NN	Number=Sing	5	obl	_	SpaceAfter=No
9	,	,	PUNCT	,	_	12	punct	_	_
10	so	so	ADV	RB	_	12	advmod	_	_
11	there	there	PRON	EX	PronType=Dem	12	expl	_	_
12	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	parataxis	_	_
13	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	12	nsubj	_	_
14	left	leave	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	13	acl	_	_
15	to	to	PART	TO	_	16	mark	_	_
16	glue	glue	VERB	VB	VerbForm=Inf	14	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **destroy** | past · passive | the fire | the atoms |  |  |  | all *property* | vn destroy-44 «NP V NP»: agent=Agent subject=Patient |
| 2 | **be** | present | nothing |  |  | there |  |  | vn exist-47.1 «NP V»: agent=Theme |
| 3 | **leave** | participle |  |  |  |  |  |  | vn escape-51.1-1-1 «NP V»: agent=Theme |
| 4 | **glue** | to-infinitive |  |  |  |  |  |  | vn tape-22.4 «NP V ADV-Middle»: 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.

<!-- /div -->

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