---
title: A crab is hiding under a rock where the octopus cannot see it. How m… — Octopuses, squid and cuttlefish · tree and pragmatics
description: A crab is hiding under a rock where the octopus cannot see it. How might the octopus still find it? Test 2 · ★★★ of lesson 39 «Octopuses, squid and cuttlefish» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice wa
---

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# Test 2 · ★★★ · Octopuses, squid and cuttlefish

<!-- .ven lang=en -->
A crab is hiding under a rock where the octopus cannot see it. How might the octopus still find it?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 1 · wrong ✗ · **Who acts:** crab, octopus · **What happens:** hide, not see, find · **To what, where:** rock, crab

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This is test 2 · ★★★ of lesson 39 «Octopuses, squid and cuttlefish» 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/39-octopuses-squid-and-cuttlefish/#t2).

## The question {#question}

<!-- .note -->
*Sentence 1:* A crab is hiding under a rock where the octopus cannot see it.

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:1
# text = A crab is hiding under a rock where the octopus cannot see it.
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	crab	crab	NOUN	NN	Number=Sing	4	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
4	hiding	hide	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	_	_
5	under	under	ADP	IN	_	7	case	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	rock	rock	NOUN	NN	Number=Sing	4	obl	_	_
8	where	where	ADV	WRB	PronType=Rel	13	advmod	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	octopus	octopus	NOUN	NN	Number=Sing	13	nsubj	_	_
11	can	can	AUX	MD	VerbForm=Fin	13	aux	_	SpaceAfter=No
12	not	not	PART	RB	Polarity=Neg	13	advmod	_	_
13	see	see	VERB	VB	VerbForm=Inf	7	acl:relcl	_	_
14	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	13	obj	_	SpaceAfter=No
15	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hide** | present · progressive | a crab |  |  | a rock |  |  | vn concealment-16-1 «NP V PP.location»: agent=Agent under rock=Location |
| 2 | **not** **see** | can | the octopus | crab |  |  |  |  | vn comprehend-87.2-1-1 «NP V NP»: agent=Experiencer it=Stimulus |

<!-- .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:* How might the octopus still find it?

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:2
# text = How might the octopus still find it?
1	How	how	ADV	WRB	PronType=Int	6	advmod	_	_
2	might	might	AUX	MD	VerbForm=Fin	6	aux	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	octopus	octopus	NOUN	NN	Number=Sing	6	nsubj	_	_
5	still	still	ADV	RB	_	6	advmod	_	_
6	find	find	VERB	VB	VerbForm=Inf	0	root	_	_
7	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	6	obj	_	SpaceAfter=No
8	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **find** | might | the octopus | crab |  |  | still |  | vn discover-84 «NP V NP»: agent=Agent it=Topic |

## The options {#options}

### Option 1 · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Its arm suckers taste the crab when they touch it

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:o1:1
# text = Its arm suckers taste the crab when they touch it
1	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
2	arm	arm	NOUN	NN	Number=Sing	3	compound	_	_
3	suckers	sucker	NOUN	NNS	Number=Plur	4	nsubj	_	_
4	taste	taste	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	crab	crab	NOUN	NN	Number=Sing	4	obj	_	_
7	when	when	SCONJ	WRB	_	9	mark	_	_
8	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	9	nsubj	_	_
9	touch	touch	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	advcl	_	_
10	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **taste** | present | Its arm suckers | the crab |  |  |  |  | vn seem-109 «NP V ADJ»: agent=Theme crab=Attribute |
| 2 | **touch** | present | suckers *= sucker* | crab |  |  |  |  | vn contiguous\_location-47.8-1 «NP V NP»: agent=Theme it=Co-Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
It hears the crab's heart beating

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:o2:1
# text = It hears the crab's heart beating
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	hears	hear	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	crab	crab	NOUN	NN	Number=Sing	7	nmod:poss	_	SpaceAfter=No
5	's	's	PART	POS	_	4	case	_	_
6	heart	heart	NOUN	NN	Number=Sing	7	compound	_	_
7	beating	beating	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hear** | present | It | the crab's heart beating |  |  |  |  | vn see-30.1-1-1 «NP V S»: agent=Experiencer beating=Stimulus |
| 2 | **beat** |  | the crab |  |  |  |  |  | nom beating «act transitive»: poss=agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
It cannot find hidden food

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:o3:1
# text = It cannot find hidden food
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	can	can	AUX	MD	VerbForm=Fin	4	aux	_	SpaceAfter=No
3	not	not	PART	RB	Polarity=Neg	4	advmod	_	_
4	find	find	VERB	VB	VerbForm=Inf	0	root	_	_
5	hidden	hidden	ADJ	JJ	Degree=Pos	6	amod	_	_
6	food	food	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **find** | can | It | hidden food |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent food=Topic |

### Option 4 · ← Mova's choice {#o4}

<!-- .ven lang=en -->
It smells it from a mile away

```conllu
# sent_id = question:biology:39-octopuses-squid-and-cuttlefish:t2:o4:1
# text = It smells it from a mile away
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	smells	smell	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	obj	_	_
4	from	from	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	mile	mile	NOUN	NN	Number=Sing	2	obl	_	_
7	away	away	ADV	RB	_	2	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **smell** | present | It | it |  |  |  | from a mile; away *property* | vn see-30.1 «NP V NP»: agent=Experiencer it=Stimulus |

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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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