---
title: «why would anyone build a bridge for crabs lol» What is the reason? — The future of life: de-extinction, cli… · tree and pragmatics
description: «why would anyone build a bridge for crabs lol» What is the reason? Test 8 · ★★ of lesson 297 «The future of life: de-extinction, climate, coral and frozen zoos» 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 
---

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# Test 8 · ★★ · The future of life: de-extinction, climate, coral and froz…

<!-- .ven lang=en -->
«why would anyone build a bridge for crabs lol» What is the reason?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** anyone · **What happens:** build, be · **To what, where:** bridge, reason · **Speech:** someone speaks here

<!-- .vabout -->
This is test 8 · ★★ of lesson 297 «The future of life: de-extinction, climate, coral and frozen zoos» 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/297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos/#t8).

## The question {#question}

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t8:1
# text = «why would anyone build a bridge for crabs lol» What is the reason?
1	«	«	PUNCT	``	_	5	punct	_	SpaceAfter=No
2	why	why	ADV	WRB	PronType=Int	5	advmod	_	_
3	would	would	AUX	MD	VerbForm=Fin	5	aux	_	_
4	anyone	anyone	PRON	NN	Number=Sing|PronType=Ind	5	nsubj	_	_
5	build	build	VERB	VB	VerbForm=Inf	15	csubj	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	bridge	bridge	NOUN	NN	Number=Sing	5	obj	_	_
8	for	for	ADP	IN	_	9	case	_	_
9	crabs	crab	NOUN	NNS	Number=Plur	5	obl	_	_
10	lol	lol	INTJ	UH	_	5	discourse	_	SpaceAfter=No
11	»	»	PUNCT	''	_	5	punct	_	_
12	What	what	PRON	WP	PronType=Int	15	nsubj	_	_
13	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	cop	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	reason	reason	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
16	?	?	PUNCT	.	_	15	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **build** *in a quote* | would | anyone | a bridge |  |  |  | for crabs | vn build-26.1-1 «NP V NP PP.beneficiary»: agent=Agent bridge=Product for crab=Beneficiary |
| 2 | **is a** | present |  | the reason |  |  |  |  | tree rules |

<!-- .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 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Millions of red crabs cross roads on Christmas Island; bridges stop them being squashed

<!-- fold The tree, 14 words -->
```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t8:o1:1
# text = Millions of red crabs cross roads on Christmas Island; bridges stop them being squashed
1	Millions	million	NOUN	NNS	Number=Plur	5	nsubj	_	_
2	of	of	ADP	IN	_	4	case	_	_
3	red	red	ADJ	JJ	Degree=Pos	4	amod	_	_
4	crabs	crab	NOUN	NNS	Number=Plur	1	nmod	_	_
5	cross	cross	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	roads	road	NOUN	NNS	Number=Plur	5	obj	_	_
7	on	on	ADP	IN	_	9	case	_	_
8	Christmas	Christmas	PROPN	NNP	Number=Sing	9	compound	_	_
9	Island	Island	PROPN	NNP	Number=Sing	6	nmod	_	SpaceAfter=No
10	;	;	PUNCT	:	_	12	punct	_	_
11	bridges	bridge	NOUN	NNS	Number=Plur	12	nsubj	_	_
12	stop	stop	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	conj	_	_
13	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	12	obj	_	_
14	being	be	AUX	VBG	Tense=Pres|VerbForm=Part	15	aux:pass	_	_
15	squashed	squash	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	12	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cross** | present | Millions of red crabs | roads |  | Christmas Island |  |  | vn crane-40.3.2 «NP V NP»: agent=Agent road=Patient |
| 2 | **stop** | present | bridges | roads *= road* |  |  |  |  | tree rules |
| 3 | **squash** | gerund · passive | bridges *not said here* |  |  |  |  |  | vn bump-18.4-1 «NP V together» |

### Option 2 {#o2}

<!-- .ven lang=en -->
Crabs like to walk high up so they can see the sea from far away

<!-- fold The tree, 15 words -->
```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t8:o2:1
# text = Crabs like to walk high up so they can see the sea from far away
1	Crabs	crab	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	like	like	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	to	to	PART	TO	_	4	mark	_	_
4	walk	walk	VERB	VB	VerbForm=Inf	2	xcomp	_	_
5	high	high	ADV	RB	Degree=Pos	6	advmod	_	_
6	up	up	ADV	RB	_	4	advmod	_	_
7	so	so	SCONJ	IN	_	10	mark	_	_
8	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	10	nsubj	_	_
9	can	can	AUX	MD	VerbForm=Fin	10	aux	_	_
10	see	see	VERB	VB	VerbForm=Inf	4	advcl	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
12	sea	sea	NOUN	NN	Number=Sing	10	obj	_	_
13	from	from	ADP	IN	_	14	case	_	_
14	far	far	ADV	RB	Degree=Pos	10	advmod	_	_
15	away	away	ADV	RB	_	14	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **like** | present | Crabs |  |  |  |  |  | vn want-32.1-1-1 «NP V NP S\_INF»: agent=Pivot clause=Theme |
| 2 | **walk** *not said to happen* | to-infinitive | Crabs *not said here* |  |  |  |  |  | vn run-51.3.2-2-1 «NP V»: agent=Theme |
| 3 | **see** | can | Crabs *= crab* | the sea |  |  |  | far *property* | vn comprehend-87.2-1-1 «NP V NP»: agent=Experiencer sea=Stimulus |

### Option 3 {#o3}

<!-- .ven lang=en -->
To keep crabs out of the forest

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t8:o3:1
# text = To keep crabs out of the forest
1	To	to	PART	TO	_	2	mark	_	_
2	keep	keep	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	crabs	crab	NOUN	NNS	Number=Plur	2	obj	_	_
4	out	out	ADP	IN	_	7	case	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	forest	forest	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **keep** | to-infinitive |  | crabs |  | the forest |  |  | vn keep-15.2 «NP V NP PP.location»: agent=Agent crab=Theme out forest=Location |

### Option 4 {#o4}

<!-- .ven lang=en -->
Crabs pay to use the bridge

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t8:o4:1
# text = Crabs pay to use the bridge
1	Crabs	crab	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	pay	pay	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	to	to	PART	TO	_	4	mark	_	_
4	use	use	VERB	VB	VerbForm=Inf	2	advcl	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	bridge	bridge	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pay** | present | Crabs |  |  |  |  |  | vn pay-68-1 «NP V NP»: agent=Agent |
| 2 | **use** | to-infinitive | Crabs *not said here* | the bridge |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent bridge=Patient |

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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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