---
title: If you change two things, you can't tell which one made the differen… — Let's test it! Experiments and fair tests · tree and pragmatics
description: If you change two things, you can't tell which one made the difference. Who acts: you, one. 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 3

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If you change two things, you can't tell which one made the difference.

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**Who acts:** you, one · **What happens:** change, not tell, make · **To what, where:** two things, difference · **Speech:** someone speaks here

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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 (you, one), 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:3
# text = If you change two things, you can't tell which one made the difference.
# 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): no change
1	If	if	SCONJ	IN	_	3	mark	_	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	3	nsubj	_	_
3	change	change	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	10	advcl	_	_
4	two	two	NUM	CD	NumForm=Word|NumType=Card	5	nummod	_	_
5	things	thing	NOUN	NNS	Number=Plur	3	obj	_	_
6	,	,	PUNCT	,	_	3	punct	_	_
7	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	10	nsubj	_	_
8	ca	can	AUX	MD	VerbForm=Fin	10	aux	_	_
9	n't	not	PART	RB	Polarity=Neg	10	advmod	_	_
10	tell	tell	VERB	VB	VerbForm=Inf	0	root	_	_
11	which	which	DET	WDT	PronType=Int	12	det	_	_
12	one	one	NOUN	NN	Number=Sing	13	nsubj	_	_
13	made	make	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	10	ccomp	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	difference	difference	NOUN	NN	Number=Sing	13	obj	_	_
16	.	.	PUNCT	.	_	10	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: changed act=assert

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **change** *a condition, not said to happen* | present | you | two things |  |  |  |  | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent thing=Patient |
| 2 | **not** **tell** *speech: assert* | can | you |  |  |  |  |  | vn transfer\_mesg-37.1.1-1-1 «NP V how S»: agent=Agent clause=Topic |
| 3 | **make** | past | which one | the difference |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset difference=Product |

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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:3`.

**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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