---
title: If a lab had no indicators at all, how could a scientist still measu… — Indicators: the red-cabbage rainbow · tree and pragmatics
description: If a lab had no indicators at all, how could a scientist still measure pH? Test 11 · ★ of lesson 17 «Indicators: the red-cabbage rainbow» of the chemistry 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 11 · ★ · Indicators: the red-cabbage rainbow

<!-- .ven lang=en -->
If a lab had no indicators at all, how could a scientist still measure pH?

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** lab, scientist · **What happens:** have, measure · **To what, where:** indicators, all, pH

<!-- .vabout -->
This is test 11 · ★ of lesson 17 «Indicators: the red-cabbage rainbow» of the chemistry 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/chemistry/17-indicators-the-red-cabbage-rainbow/#t11).

## The question {#question}

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:t11:1
# text = If a lab had no indicators at all, how could a scientist still measure pH?
1	If	if	SCONJ	IN	_	4	mark	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	lab	lab	NOUN	NN	Number=Sing	4	nsubj	_	_
4	had	have	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	15	advcl	_	_
5	no	no	DET	DT	PronType=Neg	6	det	_	_
6	indicators	indicator	NOUN	NNS	Number=Plur	4	obj	_	_
7	at	at	ADP	IN	_	8	case	_	_
8	all	all	DET	DT	PronType=Tot	4	obl	_	SpaceAfter=No
9	,	,	PUNCT	,	_	15	punct	_	_
10	how	how	ADV	WRB	PronType=Int	15	advmod	_	_
11	could	could	AUX	MD	VerbForm=Fin	15	aux	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
13	scientist	scientist	NOUN	NN	Number=Sing	15	nsubj	_	_
14	still	still	ADV	RB	_	15	advmod	_	_
15	measure	measure	VERB	VB	VerbForm=Inf	0	root	_	_
16	pH	ph	NOUN	NN	Number=Sing	15	obj	_	SpaceAfter=No
17	?	?	PUNCT	.	_	15	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** *a condition, not said to happen* | past | a lab | no indicators |  | all |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent indicator=Patient |
| 2 | **measure** | could | a scientist | pH |  |  | still |  | vn register-54.1-2-1 «NP V NP.value»: agent=Theme ph=Value |

<!-- .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 -->
By tasting every liquid

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:t11:o1:1
# text = By tasting every liquid
1	By	by	SCONJ	IN	_	2	mark	_	_
2	tasting	taste	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
3	every	every	DET	DT	PronType=Tot	4	det	_	_
4	liquid	liquid	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **taste** | gerund |  | every liquid |  |  |  |  | vn seem-109 «NP V ADJ»: agent=Theme liquid=Attribute |

### Option 2 {#o2}

<!-- .ven lang=en -->
By looking at it under a lamp

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:t11:o2:1
# text = By looking at it under a lamp
1	By	by	SCONJ	IN	_	2	mark	_	_
2	looking	look	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
3	at	at	ADP	IN	_	4	case	_	_
4	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	obl	_	_
5	under	under	ADP	IN	_	7	case	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	lamp	lamp	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **look** | gerund |  |  |  |  |  | under a lamp; at it | vn peer-30.3 «NP V PP.theme»: agent=Agent at it=Theme |

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

<!-- .ven lang=en -->
With an electronic pH meter

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:t11:o3:1
# text = With an electronic pH meter
1	With	with	ADP	IN	_	5	case	_	_
2	an	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
3	electronic	electronic	ADJ	JJ	Degree=Pos	5	amod	_	_
4	pH	ph	NOUN	NN	Number=Sing	5	compound	_	_
5	meter	meter	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
By weighing the liquid

```conllu
# sent_id = question:chemistry:17-indicators-the-red-cabbage-rainbow:t11:o4:1
# text = By weighing the liquid
1	By	by	SCONJ	IN	_	2	mark	_	_
2	weighing	weigh	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	liquid	liquid	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **weigh** | gerund |  | the liquid |  |  |  |  | vn register-54.1-2-1 «NP V NP.value»: agent=Theme liquid=Value |

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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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- next →: [Indicators: the red-cabbage rainbow, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/17-indicators-the-red-cabbage-rainbow/e1/)
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