---
title: A gas leak can explode if a flame or spark lights it. — Smells that warn · tree and pragmatics
description: A gas leak can explode if a flame or spark lights it. Who acts: gas leak, flame. A sentence of the lesson «Smells that warn» of the everyday course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Smells that warn, sentence 20

<!-- .ven lang=en -->
A gas leak can explode if a flame or spark lights it.

<!-- .vintro -->
**Who acts:** gas leak, flame · **What happens:** explode, light · **To what, where:** leak

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This is a sentence of the lesson «Smells that warn» of the everyday 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 (gas leak, flame), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:everyday:013-smells-that-warn.lesson:20
# text = A gas leak can explode if a flame or spark lights it.
# source = school lesson (ours)
# course = everyday
# lesson = 013-smells-that-warn.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	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	gas	gas	NOUN	NN	Number=Sing	3	compound	_	_
3	leak	leak	NOUN	NN	Number=Sing	5	nsubj	_	_
4	can	can	AUX	MD	VerbForm=Fin	5	aux	_	_
5	explode	explode	VERB	VB	VerbForm=Inf	0	root	_	_
6	if	if	SCONJ	IN	_	11	mark	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	flame	flame	NOUN	NN	Number=Sing	11	nsubj	_	_
9	or	or	CCONJ	CC	_	10	cc	_	_
10	spark	spark	NOUN	NN	Number=Sing	8	conj	_	_
11	lights	light	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	_	_
12	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	11	obj	_	_
13	.	.	PUNCT	.	_	5	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 | **explode** | can | a gas leak |  |  |  |  |  | vn sound\_emission-43.2 «NP V»: agent=Theme |
| 2 | **light** *a condition, not said to happen* | present | a flame or spark | leak |  |  |  |  | vn preparing-26.3-1 «NP V NP»: agent=Agent it=Product |

<!-- .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:everyday:013-smells-that-warn.lesson:20`.

**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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