---
title: Light can travel along thin glass threads, called optical fibres, bo… — Lenses and eyes · tree and pragmatics
description: Light can travel along thin glass threads, called optical fibres, bouncing inside them, and the internet uses such fibres under the sea. Who acts: Light, thin glass threads, internet. A sentence of the lesson «Lenses and eyes» of the physics course of Mova's primary school with its dependency tree a
---

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# Lenses and eyes, sentence 16

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Light can travel along thin glass threads, called optical fibres, bouncing inside them, and the internet uses such fibres under the sea.

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**Who acts:** Light, thin glass threads, internet · **What happens:** travel, call, bounce, use · **To what, where:** thin glass threads, optical fibres, such fibres, sea · **Speech:** someone speaks here

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This is a sentence of the lesson «Lenses and eyes» of the physics 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, thin glass threads, internet), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:022-lenses-and-eyes.lesson:16
# text = Light can travel along thin glass threads, called optical fibres, bouncing inside them, and the internet uses such fibres under the sea.
# source = school lesson (ours)
# course = physics
# lesson = 022-lenses-and-eyes.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	3	nsubj	_	_
2	can	can	AUX	MD	VerbForm=Fin	3	aux	_	_
3	travel	travel	VERB	VB	VerbForm=Inf	0	root	_	_
4	along	along	ADP	IN	_	7	case	_	_
5	thin	thin	ADJ	JJ	Degree=Pos	7	amod	_	_
6	glass	glass	NOUN	NN	Number=Sing	7	compound	_	_
7	threads	thread	NOUN	NNS	Number=Plur	3	obl	_	_
8	,	,	PUNCT	,	_	9	punct	_	_
9	called	call	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	acl	_	_
10	optical	optical	ADJ	JJ	Degree=Pos	11	amod	_	_
11	fibres	fibre	NOUN	NNS	Number=Plur	9	obj	_	_
12	,	,	PUNCT	,	_	13	punct	_	_
13	bouncing	bounce	VERB	VBG	Tense=Pres|VerbForm=Part	3	advcl	_	_
14	inside	inside	ADP	IN	_	15	case	_	_
15	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	13	obl	_	_
16	,	,	PUNCT	,	_	20	punct	_	_
17	and	and	CCONJ	CC	_	20	cc	_	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	_	_
19	internet	internet	NOUN	NN	Number=Sing	20	nsubj	_	_
20	uses	use	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
21	such	such	ADJ	JJ	Degree=Pos	22	amod	_	_
22	fibres	fibre	NOUN	NNS	Number=Plur	20	obj	_	_
23	under	under	ADP	IN	_	25	case	_	_
24	the	the	DET	DT	Definite=Def|PronType=Art	25	det	_	_
25	sea	sea	NOUN	NN	Number=Sing	20	obl	_	_
26	.	.	PUNCT	.	_	3	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 | **travel** | can | Light |  |  | thin glass threads |  |  | vn run-51.3.2-1 «NP V PP.location»: agent=Theme along thread=Trajectory |
| 2 | **call** | participle | thin glass threads *not said here* | optical fibres |  |  |  |  | vn initiate\_communication-37.4.2-1 «NP V NP.recipient»: agent=Agent fibre=Recipient |
| 3 | **bounce** | gerund | Light *not said here* |  |  |  |  | inside fibres *= fibre* | vn run-51.3.2-2 «NP V PP.location»: agent=Theme inside they=Trajectory |
| 4 | **use** | present | the internet | such fibres |  | the sea |  |  | vn eat-39.1 «NP V NP»: agent=Agent fibre=Patient |

<!-- .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:physics:022-lenses-and-eyes.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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