---
title: A mirror does not really swap left and right; it swaps front and bac… — Mirrors, rainbows and the blue sky · tree and pragmatics
description: A mirror does not really swap left and right; it swaps front and back, which makes writing look back to front. Who acts: mirror, front, writing. A sentence of the lesson «Mirrors, rainbows and the blue sky» of the physics course of Mova's primary school with its dependency tree and the pragmatics of
---

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# Mirrors, rainbows and the blue sky, sentence 6

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A mirror does not really swap left and right; it swaps front and back, which makes writing look back to front.

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**Who acts:** mirror, front, writing · **What happens:** not swap, swap, make, look back · **To what, where:** left, front, writing

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This is a sentence of the lesson «Mirrors, rainbows and the blue sky» 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 (mirror, front, writing), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:021-mirrors-rainbows-and-the-blue-sky.lesson:6
# text = A mirror does not really swap left and right; it swaps front and back, which makes writing look back to front.
# source = school lesson (ours)
# course = physics
# lesson = 021-mirrors-rainbows-and-the-blue-sky.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): R2-punct-next ×1, R7-rel-agree ×1, R8-pos-agree ×2
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	mirror	mirror	NOUN	NN	Number=Sing	6	nsubj	_	_
3	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	aux	_	_
4	not	not	PART	RB	Polarity=Neg	6	advmod	_	_
5	really	really	ADV	RB	_	6	advmod	_	_
6	swap	swap	VERB	VB	VerbForm=Inf	0	root	_	_
7	left	left	NOUN	NN	Number=Sing	6	obj	_	_
8	and	and	CCONJ	CC	_	9	cc	_	_
9	right	right	ADJ	JJ	Degree=Pos	7	conj	_	Agree=R8-pos-agree|Haiku=7:conj|HaikuPos=NOUN:NN:Number=Sing
10	;	;	PUNCT	,	_	12	punct	_	Agree=R2-punct-next|Haiku=6:punct
11	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	12	nsubj	_	_
12	swaps	swap	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	parataxis	_	Agree=R7-rel-agree|Haiku=6:conj
13	front	front	NOUN	NN	Number=Sing	12	obj	_	_
14	and	and	CCONJ	CC	_	15	cc	_	_
15	back	back	NOUN	NN	Number=Sing	13	conj	_	_
16	,	,	PUNCT	,	_	18	punct	_	_
17	which	which	PRON	WDT	PronType=Rel	18	nsubj	_	_
18	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	13	advcl:relcl	_	_
19	writing	writing	NOUN	NN	Number=Sing	18	obj	_	Agree=R8-pos-agree|Haiku=18:obj|HaikuPos=VERB:VBG:VerbForm=Ger
20	look	look	VERB	VB	VerbForm=Inf	18	xcomp	_	_
21	back	back	ADV	RB	_	20	advmod	_	_
22	to	to	ADP	IN	_	23	case	_	_
23	front	front	NOUN	NN	Number=Sing	20	obl	_	_
24	.	.	PUNCT	.	_	6	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
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 | **not** **swap** | present · do-support | a mirror | left |  |  |  |  | vn exchange-13.6.1 «NP V NP»: agent=Agent left=Theme |
| 2 | **swap** | present | mirror | front and back |  |  |  |  | vn exchange-13.6.1 «NP V NP»: agent=Agent front=Theme |
| 3 | **make** | present | front and back | writing |  |  |  |  | tree rules |
| 4 | **look back** | infinitive | writing *not said here* |  |  |  |  | to front | vn peer-30.3 «NP V PP.theme»: agent=Agent to front=Theme |

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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:physics:021-mirrors-rainbows-and-the-blue-sky.lesson:6`.

**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): R2-punct-next ×1, R7-rel-agree ×1, R8-pos-agree ×2. **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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