---
title: Why can an elephantnose fish find worms in a river so muddy that no… — Electric senses: electric eels, sharks… · tree and pragmatics
description: Why can an elephantnose fish find worms in a river so muddy that no one could see? Test 8 · ★ of lesson 231 «Electric senses: electric eels, sharks, the platypus bill and charged bees» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each
---

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# Test 8 · ★ · Electric senses: electric eels, sharks, the platypus bill…

<!-- .ven lang=en -->
Why can an elephantnose fish find worms in a river so muddy that no one could see?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **Who acts:** elephantnose fish, one · **What happens:** find, see · **To what, where:** worms, river

<!-- .vabout -->
This is test 8 · ★ of lesson 231 «Electric senses: electric eels, sharks, the platypus bill and charged bees» of the biology 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/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/#t8).

## The question {#question}

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t8:1
# text = Why can an elephantnose fish find worms in a river so muddy that no one could see?
1	Why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	can	can	AUX	MD	VerbForm=Fin	6	aux	_	_
3	an	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	elephantnose	elephantnose	NOUN	NN	Number=Sing	5	compound	_	_
5	fish	fish	NOUN	NN	Number=Sing	6	nsubj	_	_
6	find	find	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	12	advcl	_	_
7	worms	worm	NOUN	NNS	Number=Plur	6	obj	_	_
8	in	in	ADP	IN	_	10	case	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
10	river	river	NOUN	NN	Number=Sing	6	obl	_	_
11	so	so	ADV	RB	_	12	advmod	_	_
12	muddy	muddy	ADJ	JJ	Degree=Pos	0	root	_	_
13	that	that	SCONJ	IN	_	17	mark	_	_
14	no	no	DET	DT	PronType=Neg	15	det	_	_
15	one	one	NOUN	NN	Number=Sing	17	nsubj	_	_
16	could	could	AUX	MD	VerbForm=Fin	17	aux	_	_
17	see	see	VERB	VB	VerbForm=Inf	12	advcl	_	SpaceAfter=No
18	?	?	PUNCT	.	_	12	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **find** | can | a elephantnose fish | worms |  | a river |  |  | vn discover-84 «NP V NP»: agent=Agent worm=Topic |
| 2 | **see** | could | no one |  |  |  |  |  | vn comprehend-87.2-1-1 «NP V»: agent=Experiencer |

<!-- .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 -->
It has extra big eyes

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t8:o1:1
# text = It has extra big eyes
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	extra	extra	ADJ	JJ	Degree=Pos	5	amod	_	_
4	big	big	ADJ	JJ	Degree=Pos	5	amod	_	_
5	eyes	eye	NOUN	NNS	Number=Plur	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | It | extra big eyes |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent eye=Patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
It follows the light of glow-worms

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t8:o2:1
# text = It follows the light of glow-worms
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	follows	follow	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	light	light	NOUN	NN	Number=Sing	2	obj	_	_
5	of	of	ADP	IN	_	8	case	_	_
6	glow	glow	NOUN	NN	Number=Sing	8	compound	_	SpaceAfter=No
7	-	-	PUNCT	HYPH	_	6	punct	_	SpaceAfter=No
8	worms	worm	NOUN	NNS	Number=Plur	4	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **follow** | present | It | the light of glow worms |  |  |  |  | vn chase-51.6 «NP V NP»: agent=Agent light=Theme |
| 2 | **light** |  |  | glow worms |  |  |  |  | nom light «phenomenon transitive»: of=patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
It only ever eats in clear water

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t8:o3:1
# text = It only ever eats in clear water
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	only	only	ADV	RB	_	4	advmod	_	_
3	ever	ever	ADV	RB	PronType=Ind	4	advmod	_	_
4	eats	eat	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	clear	clear	ADJ	JJ	Degree=Pos	7	amod	_	_
7	water	water	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **eat** | present | It |  |  | clear water | ever |  | vn eat-39.1-1 «NP V»: agent=Agent |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
It feels changes in the electric field it makes around itself

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t8:o4:1
# text = It feels changes in the electric field it makes around itself
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	feels	feel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	changes	change	NOUN	NNS	Number=Plur	2	obj	_	_
4	in	in	ADP	IN	_	7	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	electric	electric	ADJ	JJ	Degree=Pos	7	amod	_	_
7	field	field	NOUN	NN	Number=Sing	2	obl	_	_
8	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
9	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	parataxis	_	_
10	around	around	ADP	IN	_	11	case	_	_
11	itself	itself	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs|Reflex=Yes	9	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **feel** | present | It | changes |  | the electric field |  |  | vn hunt-35.1 «NP V NP PP.location»: agent=Agent change=Theme in field=Location |
| 2 | **make** | present | field |  |  |  |  | around field | vn build-26.1-1 «NP.material V NP»: agent=Material |

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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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