---
title: A periscope uses two mirrors to bend the path of light twice, so you… — Mirrors, shadows and colours · tree and pragmatics
description: A periscope uses two mirrors to bend the path of light twice, so you can see over a wall or out of a submarine. Who acts: periscope, you. A sentence of the lesson «Mirrors, shadows and colours» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Mirrors, shadows and colours, sentence 2

<!-- .ven lang=en -->
A periscope uses two mirrors to bend the path of light twice, so you can see over a wall or out of a submarine.

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**Who acts:** periscope, you · **What happens:** use, bend, see · **To what, where:** two mirrors, path, wall

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This is a sentence of the lesson «Mirrors, shadows and colours» of the world 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 (periscope, you), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:084-mirrors-shadows-colours.lesson:2
# text = A periscope uses two mirrors to bend the path of light twice, so you can see over a wall or out of a submarine.
# source = school lesson (ours)
# course = world
# lesson = 084-mirrors-shadows-colours.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 ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	periscope	periscope	NOUN	NN	Number=Sing	3	nsubj	_	_
3	uses	use	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	two	two	NUM	CD	NumForm=Word|NumType=Card	5	nummod	_	_
5	mirrors	mirror	NOUN	NNS	Number=Plur	3	obj	_	_
6	to	to	PART	TO	_	7	mark	_	_
7	bend	bend	VERB	VB	VerbForm=Inf	3	advcl	_	Agree=R5-strong|Haiku=5:acl
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	path	path	NOUN	NN	Number=Sing	7	obj	_	_
10	of	of	ADP	IN	_	11	case	_	_
11	light	light	NOUN	NN	Number=Sing	9	nmod	_	_
12	twice	twice	ADV	RB	NumForm=Word|NumType=Mult	7	advmod	_	_
13	,	,	PUNCT	,	_	17	punct	_	_
14	so	so	ADV	RB	_	17	advmod	_	_
15	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	17	nsubj	_	_
16	can	can	AUX	MD	VerbForm=Fin	17	aux	_	_
17	see	see	VERB	VB	VerbForm=Inf	3	parataxis	_	_
18	over	over	ADP	IN	_	20	case	_	_
19	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	_
20	wall	wall	NOUN	NN	Number=Sing	17	obl	_	_
21	or	or	CCONJ	CC	_	25	cc	_	_
22	out	out	ADP	IN	_	25	case	_	_
23	of	of	ADP	IN	_	25	case	_	_
24	a	a	DET	DT	Definite=Ind|PronType=Art	25	det	_	_
25	submarine	submarine	NOUN	NN	Number=Sing	20	conj	_	_
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 | **use** | present | a periscope | two mirrors |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent mirror=Patient |
| 2 | **bend** | to-infinitive | a periscope *not said here* | the path of light |  |  |  | twice *property* | vn knead-26.5 «NP V NP.material»: agent=Agent path=Material |
| 3 | **see** | can | you |  |  | a wall or a submarine |  |  | vn comprehend-87.2-1-1 «NP V»: agent=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:world:084-mirrors-shadows-colours.lesson:2`.

**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 ×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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