---
title: Light arrives almost at once, but sound takes about three seconds to… — Thinking like a lifeguard · tree and pragmatics
description: Light arrives almost at once, but sound takes about three seconds to travel one kilometre. Who acts: Light, sound. A sentence of the lesson «Thinking like a lifeguard» of the everyday course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Thinking like a lifeguard, sentence 15

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Light arrives almost at once, but sound takes about three seconds to travel one kilometre.

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**Who acts:** Light, sound · **What happens:** arrive, take, travel · **To what, where:** one kilometre

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This is a sentence of the lesson «Thinking like a lifeguard» 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 (Light, sound), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:everyday:050-thinking-about-outdoor-safety.lesson:15
# text = Light arrives almost at once, but sound takes about three seconds to travel one kilometre.
# source = school lesson (ours)
# course = everyday
# lesson = 050-thinking-about-outdoor-safety.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	Light	light	NOUN	NN	Number=Sing	2	nsubj	_	_
2	arrives	arrive	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	almost	almost	ADV	RB	_	5	advmod	_	_
4	at	at	ADP	IN	_	5	case	_	_
5	once	once	ADV	RB	NumForm=Word|NumType=Mult	2	advmod	_	_
6	,	,	PUNCT	,	_	9	punct	_	_
7	but	but	CCONJ	CC	_	9	cc	_	_
8	sound	sound	NOUN	NN	Number=Sing	9	nsubj	_	_
9	takes	take	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
10	about	about	ADV	RB	_	11	advmod	_	_
11	three	three	NUM	CD	NumForm=Word|NumType=Card	12	nummod	_	_
12	seconds	second	NOUN	NNS	Number=Plur	9	obj	_	_
13	to	to	PART	TO	_	14	mark	_	_
14	travel	travel	VERB	VB	VerbForm=Inf	9	advcl	_	_
15	one	one	NUM	CD	NumForm=Word|NumType=Card	16	nummod	_	_
16	kilometre	kilometre	NOUN	NN	Number=Sing	14	obj	_	_
17	.	.	PUNCT	.	_	2	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 | **arrive** | present | Light |  |  |  |  | once *property* | vn escape-51.1-1 «NP V»: agent=Theme |
| 2 | **take** | present | sound |  |  |  | second |  | vn bring-11.3 «NP V NP»: agent=Agent |
| 3 | **travel** | to-infinitive | sound *not said here* | one kilometre |  |  |  |  | vn run-51.3.2-1 «NP V NP»: agent=Theme kilometre=Trajectory |

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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:everyday:050-thinking-about-outdoor-safety.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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