---
title: Why can't bladderworts be seen catching prey on a pond walk? — Carnivorous and strange plants · tree and pragmatics
description: Why can't bladderworts be seen catching prey on a pond walk? Test 8 · ★ of lesson 61 «Carnivorous and strange plants» 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 was wrong.
---

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# Test 8 · ★ · Carnivorous and strange plants

<!-- .ven lang=en -->
Why can't bladderworts be seen catching prey on a pond walk?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** bladderworts · **What happens:** not see, catch · **To what, where:** bladderworts, prey, pond walk

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This is test 8 · ★ of lesson 61 «Carnivorous and strange plants» 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/61-carnivorous-and-strange-plants/#t8).

## The question {#question}

```conllu
# sent_id = question:biology:61-carnivorous-and-strange-plants:t8:1
# text = Why can't bladderworts be seen catching prey on a pond walk?
1	Why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	ca	can	AUX	MD	VerbForm=Fin	6	aux	_	SpaceAfter=No
3	n't	not	PART	RB	Polarity=Neg	6	advmod	_	_
4	bladderworts	bladderwort	NOUN	NNS	Number=Plur	6	nsubj:pass	_	_
5	be	be	AUX	VB	VerbForm=Inf	6	aux:pass	_	_
6	seen	see	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
7	catching	catch	VERB	VBG	VerbForm=Ger	6	xcomp	_	_
8	prey	prey	NOUN	NN	Number=Sing	7	obj	_	_
9	on	on	ADP	IN	_	12	case	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
11	pond	pond	NOUN	NN	Number=Sing	12	compound	_	_
12	walk	walk	NOUN	NN	Number=Sing	7	obl	_	SpaceAfter=No
13	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **see** | can · passive |  | bladderworts |  |  |  |  | tree rules |
| 2 | **catch** | gerund | bladderworts *not said here* | prey |  | a pond walk |  |  | vn get-13.5.1 «NP V NP»: agent=Agent prey=Theme |

<!-- .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 {#o1}

<!-- .ven lang=en -->
They only hunt in the middle of winter

```conllu
# sent_id = question:biology:61-carnivorous-and-strange-plants:t8:o1:1
# text = They only hunt in the middle of winter
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	3	nsubj	_	_
2	only	only	ADV	RB	_	3	advmod	_	_
3	hunt	hunt	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	in	in	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	middle	middle	NOUN	NN	Number=Sing	3	obl	_	_
7	of	of	ADP	IN	_	8	case	_	_
8	winter	winter	NOUN	NN	Number=Sing	6	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hunt** | present | They |  |  | the middle of winter |  |  | vn hunt-35.1 «NP V PP.theme PP.location»: agent=Agent in middle=Location |

### Option 2 {#o2}

<!-- .ven lang=en -->
They have no traps, only flowers

```conllu
# sent_id = question:biology:61-carnivorous-and-strange-plants:t8:o2:1
# text = They have no traps, only flowers
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	no	no	DET	DT	PronType=Neg	4	det	_	_
4	traps	trap	NOUN	NNS	Number=Plur	2	obj	_	SpaceAfter=No
5	,	,	PUNCT	,	_	7	punct	_	_
6	only	only	ADV	RB	_	7	advmod	_	_
7	flowers	flower	NOUN	NNS	Number=Plur	4	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | They | no traps and flowers |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent trap=Patient |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
Their traps are tiny and fire in under a thousandth of a second

```conllu
# sent_id = question:biology:61-carnivorous-and-strange-plants:t8:o3:1
# text = Their traps are tiny and fire in under a thousandth of a second
1	Their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	traps	trap	NOUN	NNS	Number=Plur	4	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	tiny	tiny	ADJ	JJ	Degree=Pos	0	root	_	_
5	and	and	CCONJ	CC	_	6	cc	_	_
6	fire	fire	NOUN	NN	Number=Sing	4	conj	_	_
7	in	in	ADP	IN	_	10	case	_	_
8	under	under	ADP	IN	_	10	case	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
10	thousandth	thousandth	NOUN	NN	Number=Sing	4	obl	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
13	second	second	NOUN	NN	Number=Sing	10	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Their traps |  |  | a thousandth of a second |  | tiny *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
They catch fish only at night

```conllu
# sent_id = question:biology:61-carnivorous-and-strange-plants:t8:o4:1
# text = They catch fish only at night
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	catch	catch	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	fish	fish	NOUN	NN	Number=Sing	2	obj	_	_
4	only	only	ADV	RB	_	6	advmod	_	_
5	at	at	ADP	IN	_	6	case	_	_
6	night	night	NOUN	NN	Number=Sing	2	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **catch** | present | They | fish |  |  | night |  | vn get-13.5.1 «NP V NP»: agent=Agent fish=Theme |

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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.

<!-- /div -->

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