---
title: Oxygen is a very reactive gas; a cut apple and a cut piece of some m… — Tarnish and how metals change · tree and pragmatics
description: Oxygen is a very reactive gas; a cut apple and a cut piece of some metals both change colour in air, in very different ways. Who acts: Oxygen, cut apple. A sentence of the lesson «Tarnish and how metals change» of the chemistry course of Mova's primary school with its dependency tree and the pragmat
---

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# Tarnish and how metals change, sentence 15

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Oxygen is a very reactive gas; a cut apple and a cut piece of some metals both change colour in air, in very different ways.

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**Who acts:** Oxygen, cut apple · **What happens:** be, change · **To what, where:** reactive gas, colour, air

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This is a sentence of the lesson «Tarnish and how metals change» 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 (Oxygen, cut apple), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:014-tarnish-and-how-metals-change.lesson:15
# text = Oxygen is a very reactive gas; a cut apple and a cut piece of some metals both change colour in air, in very different ways.
# source = school lesson (ours)
# course = chemistry
# lesson = 014-tarnish-and-how-metals-change.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	Oxygen	oxygen	NOUN	NN	Number=Sing	6	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
4	very	very	ADV	RB	_	5	advmod	_	_
5	reactive	reactive	ADJ	JJ	Degree=Pos	6	amod	_	_
6	gas	gas	NOUN	NN	Number=Sing	0	root	_	_
7	;	;	PUNCT	:	_	10	punct	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
9	cut	cut	ADJ	JJ	Degree=Pos	10	amod	_	_
10	apple	apple	NOUN	NN	Number=Sing	19	nsubj	_	_
11	and	and	CCONJ	CC	_	14	cc	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
13	cut	cut	ADJ	JJ	Degree=Pos	14	amod	_	_
14	piece	piece	NOUN	NN	Number=Sing	10	conj	_	_
15	of	of	ADP	IN	_	17	case	_	_
16	some	some	DET	DT	PronType=Ind	17	det	_	_
17	metals	metal	NOUN	NNS	Number=Plur	14	nmod	_	_
18	both	both	ADV	RB	PronType=Tot	19	advmod	_	_
19	change	change	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	conj	_	_
20	colour	colour	NOUN	NN	Number=Sing	19	obj	_	_
21	in	in	ADP	IN	_	22	case	_	_
22	air	air	NOUN	NN	Number=Sing	19	obl	_	_
23	,	,	PUNCT	,	_	27	punct	_	_
24	in	in	ADP	IN	_	27	case	_	_
25	very	very	ADV	RB	_	26	advmod	_	_
26	different	different	ADJ	JJ	Degree=Pos	27	amod	_	_
27	ways	way	NOUN	NNS	Number=Plur	19	obl	_	_
28	.	.	PUNCT	.	_	6	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 | Oxygen | a reactive gas |  |  |  |  | tree rules |
| 2 | **change** | present | a cut apple and a cut piece of some metals | colour |  | air |  | in different ways; both *property* | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent colour=Patient |

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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:014-tarnish-and-how-metals-change.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): 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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