---
title: Sodium metal reacts with air within seconds, so laboratories keep it… — Tarnish and how metals change · tree and pragmatics
description: Sodium metal reacts with air within seconds, so laboratories keep it under oil. Who acts: Sodium metal, laboratories. 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 pragmatics of every clause.
---

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# Tarnish and how metals change, sentence 16

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Sodium metal reacts with air within seconds, so laboratories keep it under oil.

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**Who acts:** Sodium metal, laboratories · **What happens:** react, keep · **To what, where:** metal, oil

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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 (Sodium metal, laboratories), 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:16
# text = Sodium metal reacts with air within seconds, so laboratories keep it under oil.
# 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	Sodium	sodium	NOUN	NN	Number=Sing	2	compound	_	_
2	metal	metal	NOUN	NN	Number=Sing	3	nsubj	_	_
3	reacts	react	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	with	with	ADP	IN	_	5	case	_	_
5	air	air	NOUN	NN	Number=Sing	3	obl	_	_
6	within	within	ADP	IN	_	7	case	_	_
7	seconds	second	NOUN	NNS	Number=Plur	3	obl	_	_
8	,	,	PUNCT	,	_	11	punct	_	_
9	so	so	ADV	RB	_	11	advmod	_	_
10	laboratories	laboratory	NOUN	NNS	Number=Plur	11	nsubj	_	_
11	keep	keep	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
12	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	11	obj	_	_
13	under	under	ADP	IN	_	14	case	_	_
14	oil	oil	NOUN	NN	Number=Sing	11	obl	_	_
15	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

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No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **react** | present | Sodium metal |  |  |  | second | with air | vn respond-113 «NP V PP.predicate»: agent=Agent with air=Eventuality |
| 2 | **keep** | present | laboratories | metal |  | oil |  |  | vn keep-15.2 «NP V NP PP.location»: agent=Agent it=Theme under oil=Location |

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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:16`.

**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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