---
title: When atoms change partners, a new substance appears, which is what h… — Molecules: when atoms join up · tree and pragmatics
description: When atoms change partners, a new substance appears, which is what happens when a nail slowly rusts in water. Who acts: atoms, new substance, nail. A sentence of the lesson «Molecules: when atoms join up» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of
---

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# Molecules: when atoms join up, sentence 3

<!-- .ven lang=en -->
When atoms change partners, a new substance appears, which is what happens when a nail slowly rusts in water.

<!-- .vintro -->
**Who acts:** atoms, new substance, nail · **What happens:** change, appear, be, rust · **To what, where:** partners, water

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This is a sentence of the lesson «Molecules: when atoms join up» 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 (atoms, new substance, nail), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:003-molecules-when-atoms-join-up.lesson:3
# text = When atoms change partners, a new substance appears, which is what happens when a nail slowly rusts in water.
# source = school lesson (ours)
# course = chemistry
# lesson = 003-molecules-when-atoms-join-up.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): no change
1	When	when	SCONJ	WRB	_	3	mark	_	_
2	atoms	atom	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	change	change	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	9	advcl	_	_
4	partners	partner	NOUN	NNS	Number=Plur	3	obj	_	_
5	,	,	PUNCT	,	_	3	punct	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	new	new	ADJ	JJ	Degree=Pos	8	amod	_	_
8	substance	substance	NOUN	NN	Number=Sing	9	nsubj	_	_
9	appears	appear	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
10	,	,	PUNCT	,	_	14	punct	_	_
11	which	which	PRON	WDT	PronType=Rel	14	obj	_	_
12	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	cop	_	_
13	what	what	PRON	WP	PronType=Int	14	nsubj	_	_
14	happens	happen	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	conj	_	_
15	when	when	SCONJ	WRB	_	19	mark	_	_
16	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	_	_
17	nail	nail	NOUN	NN	Number=Sing	19	nsubj	_	_
18	slowly	slowly	ADV	RB	_	19	advmod	_	_
19	rusts	rust	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	advcl	_	_
20	in	in	ADP	IN	_	21	case	_	_
21	water	water	NOUN	NN	Number=Sing	19	obl	_	_
22	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **change** | present | atoms | partners |  |  |  |  | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent partner=Patient |
| 2 | **appear** | present | a new substance |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |
| 3 | **is** | present |  |  |  |  |  | happen *property* | tree rules |
| 4 | **rust** | present | a nail |  |  | water |  | slowly *property* | vn entity\_specific\_cos-45.5 «NP.patient V»: agent=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.

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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:003-molecules-when-atoms-join-up.lesson:3`.

**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): no change. **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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