---
title: Clues to a chemical change are a new colour, gas bubbles, light or h… — Changes you can undo and changes you can't · tree and pragmatics
description: Clues to a chemical change are a new colour, gas bubbles, light or heat, a new smell, or something that will not change back. Who acts: Clues. A sentence of the lesson «Changes you can undo and changes you can't» of the chemistry course of Mova's primary school with its dependency tree and the pragm
---

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# Changes you can undo and changes you can't, sentence 15

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Clues to a chemical change are a new colour, gas bubbles, light or heat, a new smell, or something that will not change back.

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**Who acts:** Clues · **What happens:** be, not change back · **To what, where:** new colour

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This is a sentence of the lesson «Changes you can undo and changes you can't» of the chemistry course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Clues), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:009-changes-you-can-and-cannot-undo.lesson:15
# text = Clues to a chemical change are a new colour, gas bubbles, light or heat, a new smell, or something that will not change back.
# source = school lesson (ours)
# course = chemistry
# lesson = 009-changes-you-can-and-cannot-undo.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R3-conj-first ×1
1	Clues	clue	NOUN	NNS	Number=Plur	9	nsubj	_	_
2	to	to	ADP	IN	_	5	case	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	chemical	chemical	ADJ	JJ	Degree=Pos	5	amod	_	_
5	change	change	NOUN	NN	Number=Sing	1	nmod	_	_
6	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	9	cop	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
8	new	new	ADJ	JJ	Degree=Pos	9	amod	_	_
9	colour	colour	NOUN	NN	Number=Sing	0	root	_	_
10	,	,	PUNCT	,	_	12	punct	_	_
11	gas	gas	NOUN	NN	Number=Sing	12	compound	_	_
12	bubbles	bubble	NOUN	NNS	Number=Plur	9	conj	_	_
13	,	,	PUNCT	,	_	14	punct	_	_
14	light	light	NOUN	NN	Number=Sing	9	conj	_	Agree=R3-conj-first|Haiku=12:conj
15	or	or	CCONJ	CC	_	16	cc	_	_
16	heat	heat	NOUN	NN	Number=Sing	14	conj	_	_
17	,	,	PUNCT	,	_	20	punct	_	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	_
19	new	new	ADJ	JJ	Degree=Pos	20	amod	_	_
20	smell	smell	NOUN	NN	Number=Sing	9	conj	_	_
21	,	,	PUNCT	,	_	23	punct	_	_
22	or	or	CCONJ	CC	_	23	cc	_	_
23	something	something	PRON	NN	Number=Sing|PronType=Ind	9	conj	_	_
24	that	that	PRON	WDT	PronType=Rel	27	nsubj	_	_
25	will	will	AUX	MD	VerbForm=Fin	27	aux	_	_
26	not	not	PART	RB	Polarity=Neg	27	advmod	_	_
27	change	change	VERB	VB	VerbForm=Inf	23	acl:relcl	_	_
28	back	back	ADV	RB	_	27	advmod	_	_
29	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Clues to a chemical change | a new colour and gas bubbles and light or heat and a new smell |  |  |  |  | tree rules |
| 2 | **not** **change back** | future |  |  |  |  |  |  | vn dress-41.1.1-1-1 «NP V»: 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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:chemistry:009-changes-you-can-and-cannot-undo.lesson:15`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R3-conj-first ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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