---
title: Why does a scientist keep a control group in a medicine test? — Being a scientist — fair tests, guesse… · tree and pragmatics
description: Why does a scientist keep a control group in a medicine test? Test 9 · ★★★ of lesson 91 «Being a scientist — fair tests, guesses and evidence» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Test 9 · ★★★ · Being a scientist — fair tests, guesses and evidence

<!-- .ven lang=en -->
Why does a scientist keep a control group in a medicine test?

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** scientist · **What happens:** keep · **To what, where:** control group, medicine test

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This is test 9 · ★★★ of lesson 91 «Being a scientist — fair tests, guesses and evidence» of the world course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/world/91-being-a-scientist/#t9).

## The question {#question}

```conllu
# sent_id = question:world:91-being-a-scientist:t9:1
# text = Why does a scientist keep a control group in a medicine test?
1	Why	why	ADV	WRB	PronType=Int	5	advmod	_	_
2	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	aux	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	scientist	scientist	NOUN	NN	Number=Sing	5	nsubj	_	_
5	keep	keep	VERB	VB	VerbForm=Inf	0	root	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	control	control	NOUN	NN	Number=Sing	8	compound	_	_
8	group	group	NOUN	NN	Number=Sing	5	obj	_	_
9	in	in	ADP	IN	_	12	case	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
11	medicine	medicine	NOUN	NN	Number=Sing	12	compound	_	_
12	test	test	NOUN	NN	Number=Sing	5	obl	_	SpaceAfter=No
13	?	?	PUNCT	.	_	5	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **keep** | present · do-support | a scientist | a control group |  | a medicine test |  |  | vn keep-15.2 «NP V NP PP.location»: agent=Agent group=Theme in test=Location |

<!-- .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.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
Because the medicine needs company

```conllu
# sent_id = question:world:91-being-a-scientist:t9:o1:1
# text = Because the medicine needs company
1	Because	because	SCONJ	IN	_	4	mark	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	medicine	medicine	NOUN	NN	Number=Sing	4	nsubj	_	_
4	needs	need	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	company	company	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **need** | present | the medicine | company |  |  |  |  | vn want-32.1-1-1 «NP V NP ADV»: agent=Pivot company=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
To make the test cheaper

```conllu
# sent_id = question:world:91-being-a-scientist:t9:o2:1
# text = To make the test cheaper
1	To	to	PART	TO	_	2	mark	_	_
2	make	make	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	test	test	NOUN	NN	Number=Sing	2	obj	_	_
5	cheaper	cheap	ADJ	JJR	Degree=Cmp	2	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | to-infinitive |  | the test |  |  |  | cheap *property* | vn build-26.1-1 «NP.asset V NP»: agent=Asset test=Product |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
To see what would happen without the medicine

```conllu
# sent_id = question:world:91-being-a-scientist:t9:o3:1
# text = To see what would happen without the medicine
1	To	to	PART	TO	_	2	mark	_	_
2	see	see	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	what	what	PRON	WP	PronType=Int	5	nsubj	_	_
4	would	would	AUX	MD	VerbForm=Fin	5	aux	_	_
5	happen	happen	VERB	VB	VerbForm=Inf	2	ccomp	_	_
6	without	without	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	medicine	medicine	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **see** | to-infinitive |  |  |  |  |  |  | vn comprehend-87.2-1-1 «NP V how S\_INF»: agent=Experiencer clause=Stimulus |
| 2 | **happen** | would |  |  |  |  |  | without the medicine | vn occur-48.3-1 «NP V»: agent=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
To give the medicine to more and more people at once

```conllu
# sent_id = question:world:91-being-a-scientist:t9:o4:1
# text = To give the medicine to more and more people at once
1	To	to	PART	TO	_	2	mark	_	_
2	give	give	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	medicine	medicine	NOUN	NN	Number=Sing	2	obj	_	_
5	to	to	ADP	IN	_	9	case	_	_
6	more	more	ADJ	JJR	Degree=Cmp	9	amod	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	more	more	ADJ	JJR	Degree=Cmp	6	conj	_	_
9	people	people	NOUN	NNS	Number=Plur	2	obl	_	_
10	at	at	ADP	IN	_	11	case	_	_
11	once	once	ADV	RB	NumForm=Word|NumType=Mult	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **give** | to-infinitive |  | the medicine | more people |  |  |  | vn give-13.1-1 «NP V NP PP.recipient PP.asset»: agent=Agent medicine=Theme to people=Recipient at once=Asset |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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