---
title: Cola has a weak acid that slowly loosens rust on a nail; the story t… — Tarnish and how metals change · tree and pragmatics
description: Cola has a weak acid that slowly loosens rust on a nail; the story that cola dissolves a tooth overnight is a myth, though sugary acid drinks do harm teeth over time. Who acts: Cola, weak acid, story, sugary acid drinks. A sentence of the lesson «Tarnish and how metals change» of the chemistry cours
---

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# Tarnish and how metals change, sentence 19

<!-- .ven lang=en -->
Cola has a weak acid that slowly loosens rust on a nail; the story that cola dissolves a tooth overnight is a myth, though sugary acid drinks do harm teeth over time.

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**Who acts:** Cola, weak acid, story, sugary acid drinks · **What happens:** have, loosen, dissolve, be, harm · **To what, where:** weak acid, rust, nail, story, myth, teeth

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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 (Cola, weak acid, story, sugary acid drinks), 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:19
# text = Cola has a weak acid that slowly loosens rust on a nail; the story that cola dissolves a tooth overnight is a myth, though sugary acid drinks do harm teeth over time.
# 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): R5-strong ×2, R7-rel-agree ×2
1	Cola	Cola	PROPN	NNP	Number=Sing	2	nsubj	_	_
2	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	weak	weak	ADJ	JJ	Degree=Pos	5	amod	_	_
5	acid	acid	NOUN	NN	Number=Sing	2	obj	_	_
6	that	that	PRON	WDT	PronType=Rel	8	nsubj	_	_
7	slowly	slowly	ADV	RB	_	8	advmod	_	_
8	loosens	loosen	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	acl:relcl	_	_
9	rust	rust	NOUN	NN	Number=Sing	8	obj	_	_
10	on	on	ADP	IN	_	12	case	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
12	nail	nail	NOUN	NN	Number=Sing	8	obl	_	_
13	;	;	PUNCT	,	_	15	punct	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	story	story	NOUN	NN	Number=Sing	24	nsubj	_	_
16	that	that	PRON	WDT	PronType=Rel	18	obj	_	_
17	cola	cola	NOUN	NN	Number=Sing	18	nsubj	_	_
18	dissolves	dissolve	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	acl:relcl	_	_
19	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	Agree=R5-strong|Haiku=21:det
20	tooth	tooth	NOUN	NN	Number=Sing	18	obj	_	Agree=R5-strong|Haiku=21:compound
21	overnight	overnight	ADV	RB	_	18	advmod	_	Agree=R7-rel-agree|Haiku=18:obl:unmarked|HaikuPos=NOUN:NN:Number=Sing
22	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	24	cop	_	_
23	a	a	DET	DT	Definite=Ind|PronType=Art	24	det	_	_
24	myth	myth	NOUN	NN	Number=Sing	2	parataxis	_	Agree=R7-rel-agree|Haiku=2:conj
25	,	,	PUNCT	,	_	31	punct	_	_
26	though	though	SCONJ	IN	_	31	mark	_	_
27	sugary	sugary	ADJ	JJ	Degree=Pos	29	amod	_	_
28	acid	acid	NOUN	NN	Number=Sing	29	compound	_	_
29	drinks	drink	NOUN	NNS	Number=Plur	31	nsubj	_	_
30	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	31	aux	_	_
31	harm	harm	VERB	VB	VerbForm=Inf	24	advcl	_	_
32	teeth	tooth	NOUN	NNS	Number=Plur	31	obj	_	_
33	over	over	ADP	IN	_	34	case	_	_
34	time	time	NOUN	NN	Number=Sing	31	obl	_	_
35	.	.	PUNCT	.	_	2	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- 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 | **have** | present | Cola | a weak acid |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent acid=Patient |
| 2 | **loosen** | present | a weak acid | rust |  | a nail |  | slowly *property* | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent rust=Patient |
| 3 | **dissolve** | present | cola | the story |  |  |  | overnight *property* | vn break-45.1 «NP V NP ADJ»: agent=Agent that=Patient tooth=Result |
| 4 | **is a** | present | the story | a myth |  |  |  |  | tree rules |
| 5 | **harm** | present · do-support | sugary acid drinks | teeth |  |  | time |  | vn amuse-31.1 «NP V NP»: agent=Stimulus tooth=Experiencer |

<!-- .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:014-tarnish-and-how-metals-change.lesson:19`.

**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): R5-strong ×2, R7-rel-agree ×2. **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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- ← previous: [Tarnish and how metals change, 18](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/14-tarnish-and-how-metals-change/18/)
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