---
title: A fair test changes only one thing and keeps everything else the same. — Let's test it! Experiments and fair tests · tree and pragmatics
description: A fair test changes only one thing and keeps everything else the same. Who acts: fair test. A sentence of the lesson «Let's test it! Experiments and fair tests» of the myths course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Let's test it! Experiments and fair tests, sentence 17

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A fair test changes only one thing and keeps everything else the same.

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**Who acts:** fair test · **What happens:** change, keep · **To what, where:** one thing, everything

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This is a sentence of the lesson «Let's test it! Experiments and fair tests» of the myths 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 (fair test), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:myths:029-let-s-test-it-experiments-and-fair-tests.lesson:17
# text = A fair test changes only one thing and keeps everything else the same.
# source = school lesson (ours)
# course = myths
# lesson = 029-let-s-test-it-experiments-and-fair-tests.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, R6-punct-agree ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	fair	fair	ADJ	JJ	Degree=Pos	3	amod	_	_
3	test	test	NOUN	NN	Number=Sing	4	nsubj	_	_
4	changes	change	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	only	only	ADV	RB	_	6	advmod	_	Agree=R5-strong|Haiku=7:advmod
6	one	one	NUM	CD	NumForm=Word|NumType=Card	7	nummod	_	_
7	thing	thing	NOUN	NN	Number=Sing	4	obj	_	_
8	and	and	CCONJ	CC	_	9	cc	_	_
9	keeps	keep	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	conj	_	_
10	everything	everything	PRON	NN	Number=Sing|PronType=Tot	9	obj	_	_
11	else	else	ADV	RB	_	10	advmod	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	13	det	_	_
13	same	same	ADJ	JJ	Degree=Pos	10	nmod	_	_
14	.	.	PUNCT	.	_	4	punct	_	Agree=R6-punct-agree|Haiku=9: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 | **change** | present | a fair test | one thing |  |  |  |  | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent thing=Patient |
| 2 | **keep** | present | a fair test *not said here* | everything |  |  |  |  | vn keep-15.2 «NP V NP»: agent=Agent everything=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:myths:029-let-s-test-it-experiments-and-fair-tests.lesson:17`.

**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, R6-punct-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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