---
title: A hammerhead sweeps its head over the sand like a boy with a metal d… — Electric senses: electric eels, sharks… · tree and pragmatics
description: A hammerhead sweeps its head over the sand like a boy with a metal detector on the beach. What is it looking for? Test 5 · ★ 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 pragmat
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/t5/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [questions](https://md.mova.elamur.ai/free/en/corpora/questions/) / [Biology](https://md.mova.elamur.ai/free/en/corpora/questions/biology/) / [Electric senses: electric eels, sharks…](https://md.mova.elamur.ai/free/en/corpora/questions/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/) / t5

# Test 5 · ★ · Electric senses: electric eels, sharks, the platypus bill…

<!-- .ven lang=en -->
A hammerhead sweeps its head over the sand like a boy with a metal detector on the beach. What is it looking for?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 2 · right ✓ · **Who acts:** hammerhead · **What happens:** sweep, look · **To what, where:** head, sand

<!-- .vabout -->
This is test 5 · ★ 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/#t5).

## The question {#question}

<!-- .note -->
*Sentence 1:* A hammerhead sweeps its head over the sand like a boy with a metal detector on the beach.

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:1
# text = A hammerhead sweeps its head over the sand like a boy with a metal detector on the beach.
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	hammerhead	hammerhead	NOUN	NN	Number=Sing	3	nsubj	_	_
3	sweeps	sweep	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	5	nmod:poss	_	_
5	head	head	NOUN	NN	Number=Sing	3	obj	_	_
6	over	over	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	sand	sand	NOUN	NN	Number=Sing	3	obl	_	_
9	like	like	ADP	IN	_	11	case	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
11	boy	boy	NOUN	NN	Number=Sing	3	obl	_	_
12	with	with	ADP	IN	_	15	case	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
14	metal	metal	NOUN	NN	Number=Sing	15	compound	_	_
15	detector	detector	NOUN	NN	Number=Sing	3	obl	_	_
16	on	on	ADP	IN	_	18	case	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	beach	beach	NOUN	NN	Number=Sing	15	nmod	_	SpaceAfter=No
19	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **sweep** | present | a hammerhead | hammerhead's head |  | the sand |  | like a boy; with a metal detector on the beach | vn funnel-9.3-1-1 «NP V NP PP.trajectory»: agent=Agent head=Theme over sand=Trajectory |

<!-- .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.

<!-- .note -->
*Sentence 2:* What is it looking for?

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:2
# text = What is it looking for?
1	What	what	PRON	WP	PronType=Rel	4	obl	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
4	looking	look	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
5	for	for	ADP	IN	_	4	obl	_	SpaceAfter=No
6	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **look** | present · progressive | hammerhead |  |  |  |  |  | vn stimulus\_subject-30.4 «NP V PP.attribute»: agent=Stimulus |

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
Shiny coins dropped by careless divers

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:o1:1
# text = Shiny coins dropped by careless divers
1	Shiny	shiny	ADJ	JJ	Degree=Pos	2	amod	_	_
2	coins	coin	NOUN	NNS	Number=Plur	0	root	_	_
3	dropped	drop	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	acl	_	_
4	by	by	ADP	IN	_	6	case	_	_
5	careless	careless	ADJ	JJ	Degree=Pos	6	amod	_	_
6	divers	diver	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **drop** | participle |  | Shiny coins *not said here* |  |  |  | by careless divers | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme by diver=Trajectory |

### Option 2 · ← Mova's choice · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Stingrays hidden under the sand

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:o2:1
# text = Stingrays hidden under the sand
1	Stingrays	stingray	NOUN	NNS	Number=Plur	0	root	_	_
2	hidden	hide	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	1	acl	_	_
3	under	under	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	sand	sand	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hide** | participle |  | Stingrays *not said here* |  | the sand |  |  | vn concealment-16-1 «NP V PP.location»: agent=Agent under sand=Location |

### Option 3 {#o3}

<!-- .ven lang=en -->
Its own teeth that fell out last week

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:o3:1
# text = Its own teeth that fell out last week
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
2	own	own	ADJ	JJ	Degree=Pos	3	amod	_	_
3	teeth	tooth	NOUN	NNS	Number=Plur	5	nsubj	_	_
4	that	that	PRON	WDT	PronType=Rel	5	nsubj	_	_
5	fell	fall	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
6	out	out	ADV	RB	_	5	advmod	_	_
7	last	last	ADJ	JJ	Degree=Pos	8	amod	_	_
8	week	week	NOUN	NN	Number=Sing	5	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **fall out** | past | Its own teeth |  |  |  | week | out *property* | vn occur-48.3 «NP V»: agent=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
Patches of warm water near the bottom

```conllu
# sent_id = question:biology:231-electric-senses-eels-sharks-the-platypus-and-charged-bees:t5:o4:1
# text = Patches of warm water near the bottom
1	Patches	patch	NOUN	NNS	Number=Plur	0	root	_	_
2	of	of	ADP	IN	_	4	case	_	_
3	warm	warm	ADJ	JJ	Degree=Pos	4	amod	_	_
4	water	water	NOUN	NN	Number=Sing	1	nmod	_	_
5	near	near	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	bottom	bottom	NOUN	NN	Number=Sing	4	nmod	_	_
```

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

<!-- div src -->

**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.

<!-- /div -->

<!-- pn -->
- ← previous: [Electric senses: electric eels, sharks…, test 4](https://md.mova.elamur.ai/free/en/corpora/questions/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/t4/)
- next →: [Electric senses: electric eels, sharks…, test 6](https://md.mova.elamur.ai/free/en/corpora/questions/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/t6/)
- ↑ back to [Electric senses: electric eels, sharks, the platypus bill and charged bees](https://md.mova.elamur.ai/free/en/corpora/questions/biology/231-electric-senses-eels-sharks-the-platypus-and-charged-bees/)