---
title: Optical fibres are thin strands of glass that carry light along bend… — Glass and pottery · tree and pragmatics
description: Optical fibres are thin strands of glass that carry light along bends, because the light keeps bouncing inside the fibre; most of the internet travels through such fibres, even under the oceans. Who acts: Optical fibres, glass, light, most. A sentence of the lesson «Glass and pottery» of the chemist
---

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# Glass and pottery, sentence 18

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Optical fibres are thin strands of glass that carry light along bends, because the light keeps bouncing inside the fibre; most of the internet travels through such fibres, even under the oceans.

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**Who acts:** Optical fibres, glass, light, most · **What happens:** be, carry, keep, bounce, travel · **To what, where:** thin strands, light, fibre, such fibres

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This is a sentence of the lesson «Glass and pottery» 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 (Optical fibres, glass, light, most), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:030-glass-and-pottery.lesson:18
# text = Optical fibres are thin strands of glass that carry light along bends, because the light keeps bouncing inside the fibre; most of the internet travels through such fibres, even under the oceans.
# source = school lesson (ours)
# course = chemistry
# lesson = 030-glass-and-pottery.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): R8-pos-agree ×1
1	Optical	optical	ADJ	JJ	Degree=Pos	2	amod	_	_
2	fibres	fibre	NOUN	NNS	Number=Plur	5	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	thin	thin	ADJ	JJ	Degree=Pos	5	amod	_	_
5	strands	strand	NOUN	NNS	Number=Plur	0	root	_	_
6	of	of	ADP	IN	_	7	case	_	_
7	glass	glass	NOUN	NN	Number=Sing	5	nmod	_	_
8	that	that	PRON	WDT	PronType=Rel	9	nsubj	_	_
9	carry	carry	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	acl:relcl	_	_
10	light	light	NOUN	NN	Number=Sing	9	obj	_	_
11	along	along	ADP	IN	_	12	case	_	_
12	bends	bend	NOUN	NNS	Number=Plur	9	obl	_	_
13	,	,	PUNCT	,	_	17	punct	_	_
14	because	because	SCONJ	IN	_	17	mark	_	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	_	_
16	light	light	NOUN	NN	Number=Sing	17	nsubj	_	_
17	keeps	keep	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	advcl	_	_
18	bouncing	bounce	VERB	VBG	VerbForm=Ger	17	xcomp	_	_
19	inside	inside	ADP	IN	_	21	case	_	_
20	the	the	DET	DT	Definite=Def|PronType=Art	21	det	_	_
21	fibre	fibre	NOUN	NN	Number=Sing	18	obl	_	_
22	;	;	PUNCT	:	_	27	punct	_	_
23	most	most	ADJ	JJS	Degree=Sup	27	nsubj	_	Agree=R8-pos-agree|Haiku=27:nsubj|HaikuPos=PRON:JJS:PronType=Ind
24	of	of	ADP	IN	_	26	case	_	_
25	the	the	DET	DT	Definite=Def|PronType=Art	26	det	_	_
26	internet	internet	NOUN	NN	Number=Sing	23	nmod	_	_
27	travels	travel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	parataxis	_	_
28	through	through	ADP	IN	_	30	case	_	_
29	such	such	ADJ	JJ	Degree=Pos	30	amod	_	_
30	fibres	fibre	NOUN	NNS	Number=Plur	27	obl	_	_
31	,	,	PUNCT	,	_	35	punct	_	_
32	even	even	ADV	RB	_	35	advmod	_	_
33	under	under	ADP	IN	_	35	case	_	_
34	the	the	DET	DT	Definite=Def|PronType=Art	35	det	_	_
35	oceans	ocean	NOUN	NNS	Number=Plur	27	obl	_	_
36	.	.	PUNCT	.	_	5	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 | **is a** | present | Optical fibres | thin strands |  |  |  | of glass | tree rules |
| 2 | **carry** | present | glass | light |  |  |  | along bends | vn carry-11.4 «NP V NP»: agent=Agent light=Theme |
| 3 | **keep** | present | the light |  |  |  |  |  | tree rules |
| 4 | **bounce** | gerund | the light *not said here* |  |  | the fibre |  |  | vn run-51.3.2-2 «NP V PP.location»: agent=Theme inside fibre=Trajectory |
| 5 | **travel** | present | most of the internet |  |  | such fibres |  | under the oceans | vn run-51.3.2-1 «NP V PP.location»: agent=Theme through fibre=Trajectory |

<!-- .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:030-glass-and-pottery.lesson:18`.

**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): R8-pos-agree ×1. **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: [Glass and pottery, 17](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/30-glass-and-pottery/17/)
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