---
title: A Mars rover finds smooth, rounded pebbles like those in a stream. W… — Mars · tree and pragmatics
description: A Mars rover finds smooth, rounded pebbles like those in a stream. What do they suggest? Test 4 · ★ of lesson 8 «Mars» of the space 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 4 · ★ · Mars

<!-- .ven lang=en -->
A Mars rover finds smooth, rounded pebbles like those in a stream. What do they suggest?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** Mars rover, pebbles · **What happens:** find, suggest · **To what, where:** smooth rounded pebbles

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This is test 4 · ★ of lesson 8 «Mars» of the space 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/space/8-mars/#t4).

## The question {#question}

<!-- .note -->
*Sentence 1:* A Mars rover finds smooth, rounded pebbles like those in a stream.

```conllu
# sent_id = question:space:8-mars:t4:1
# text = A Mars rover finds smooth, rounded pebbles like those in a stream.
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	Mars	Mars	PROPN	NNP	Number=Sing	3	compound	_	_
3	rover	rover	NOUN	NN	Number=Sing	4	nsubj	_	_
4	finds	find	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	smooth	smooth	ADJ	JJ	Degree=Pos	8	amod	_	SpaceAfter=No
6	,	,	PUNCT	,	_	5	punct	_	_
7	rounded	rounded	ADJ	JJ	Degree=Pos	8	amod	_	_
8	pebbles	pebble	NOUN	NNS	Number=Plur	4	obj	_	_
9	like	like	ADP	IN	_	10	case	_	_
10	those	that	PRON	DT	Number=Plur|PronType=Dem	8	nmod	_	_
11	in	in	ADP	IN	_	13	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
13	stream	stream	NOUN	NN	Number=Sing	10	nmod	_	SpaceAfter=No
14	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **find** | present | a Mars rover | smooth rounded pebbles |  |  |  | like those | vn discover-84 «NP V NP»: agent=Agent pebble=Topic |

<!-- .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 do they suggest?

```conllu
# sent_id = question:space:8-mars:t4:2
# text = What do they suggest?
1	What	what	PRON	WP	PronType=Int	4	obj	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	4	nsubj	_	_
4	suggest	suggest	VERB	VB	VerbForm=Inf	0	root	_	SpaceAfter=No
5	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **suggest** *speech: suggest* | present · do-support | pebbles *= pebble* |  |  |  |  |  | vn say-37.7-1-1-1 «NP V NP.topic»: agent=Agent what=Topic |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
Wind on Mars rolls them round every day

```conllu
# sent_id = question:space:8-mars:t4:o1:1
# text = Wind on Mars rolls them round every day
1	Wind	wind	NOUN	NN	Number=Sing	4	nsubj	_	_
2	on	on	ADP	IN	_	3	case	_	_
3	Mars	Mars	PROPN	NNP	Number=Sing	1	nmod	_	_
4	rolls	roll	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	4	obj	_	_
6	round	round	ADV	RB	_	4	advmod	_	_
7	every	every	DET	DT	PronType=Tot	8	det	_	_
8	day	day	NOUN	NN	Number=Sing	4	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **roll** | present | Wind on Mars | them *= they* |  |  | day | round *property* | vn run-51.3.2-2 «NP V NP»: agent=Agent they=Agent |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Water once flowed there long ago

```conllu
# sent_id = question:space:8-mars:t4:o2:1
# text = Water once flowed there long ago
1	Water	water	NOUN	NN	Number=Sing	3	nsubj	_	_
2	once	once	ADV	RB	NumForm=Word|NumType=Mult	3	advmod	_	_
3	flowed	flow	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
4	there	there	ADV	RB	PronType=Dem	3	advmod	_	_
5	long	long	ADV	RB	Degree=Pos	6	advmod	_	_
6	ago	ago	ADV	RB	_	3	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **flow** | past | Water |  |  | there |  | ago, once *property* | vn appear-48.1.1 «NP V»: agent=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
Someone polished them recently

```conllu
# sent_id = question:space:8-mars:t4:o3:1
# text = Someone polished them recently
1	Someone	someone	PRON	NN	Number=Sing|PronType=Ind	2	nsubj	_	_
2	polished	polish	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
3	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	2	obj	_	_
4	recently	recently	ADV	RB	_	2	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **polish** | past | Someone | them *= they* |  |  |  | recently *property* | vn butter-9.9 «NP V NP.destination»: agent=Agent they=Destination |

### Option 4 {#o4}

<!-- .ven lang=en -->
They fell from the Moon

```conllu
# sent_id = question:space:8-mars:t4:o4:1
# text = They fell from the Moon
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	fell	fall	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
3	from	from	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	Moon	Moon	PROPN	NNP	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **fall** | past | They |  |  | the Moon |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme from moon=Initial\_Location |

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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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- ← previous: [Mars, test 3](https://md.mova.elamur.ai/free/en/corpora/questions/space/8-mars/t3/)
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