---
title: Why did the Mars rovers go to old crater lake beds? — Mars · tree and pragmatics
description: Why did the Mars rovers go to old crater lake beds? Test 7 · ★ 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 right.
---

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# Test 7 · ★ · Mars

<!-- .ven lang=en -->
Why did the Mars rovers go to old crater lake beds?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 2 · right ✓ · **Who acts:** Mars rovers · **What happens:** go · **To what, where:** old lake beds

<!-- .vabout -->
This is test 7 · ★ 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/#t7).

## The question {#question}

```conllu
# sent_id = question:space:8-mars:t7:1
# text = Why did the Mars rovers go to old crater lake beds?
1	Why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	did	do	AUX	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	6	aux	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	Mars	Mars	PROPN	NNP	Number=Sing	5	compound	_	_
5	rovers	rover	NOUN	NNS	Number=Plur	6	nsubj	_	_
6	go	go	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	_	_
7	to	to	ADP	IN	_	11	case	_	_
8	old	old	ADJ	JJ	Degree=Pos	11	amod	_	_
9	crater	crater	NOUN	NN	Number=Sing	10	compound	_	_
10	lake	lake	NOUN	NN	Number=Sing	11	compound	_	_
11	beds	bed	NOUN	NNS	Number=Plur	6	obl	_	SpaceAfter=No
12	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **go** | past · do-support | the Mars rovers |  |  | old lake beds |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme to bed=Initial\_Location |

<!-- .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 {#o1}

<!-- .ven lang=en -->
It is the only flat ground on Mars

```conllu
# sent_id = question:space:8-mars:t7:o1:1
# text = It is the only flat ground on Mars
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	6	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
4	only	only	ADJ	JJ	Degree=Pos	6	amod	_	_
5	flat	flat	ADJ	JJ	Degree=Pos	6	amod	_	_
6	ground	ground	NOUN	NN	Number=Sing	0	root	_	_
7	on	on	ADP	IN	_	8	case	_	_
8	Mars	Mars	PROPN	NNP	Number=Sing	6	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | It | the only flat ground |  | Mars |  |  | tree rules |

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

<!-- .ven lang=en -->
Old lake beds are good places to look for signs of past life

```conllu
# sent_id = question:space:8-mars:t7:o2:1
# text = Old lake beds are good places to look for signs of past life
1	Old	old	ADJ	JJ	Degree=Pos	3	amod	_	_
2	lake	lake	NOUN	NN	Number=Sing	3	compound	_	_
3	beds	bed	NOUN	NNS	Number=Plur	6	nsubj	_	_
4	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	good	good	ADJ	JJ	Degree=Pos	6	amod	_	_
6	places	place	NOUN	NNS	Number=Plur	0	root	_	_
7	to	to	PART	TO	_	8	mark	_	_
8	look	look	VERB	VB	VerbForm=Inf	6	acl	_	_
9	for	for	ADP	IN	_	10	case	_	_
10	signs	sign	NOUN	NNS	Number=Plur	8	obl	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	past	past	ADJ	JJ	Degree=Pos	13	amod	_	_
13	life	life	NOUN	NN	Number=Sing	10	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Old lake beds | good places |  |  |  |  | tree rules |
| 2 | **look** | to-infinitive |  |  |  |  |  | for signs of past life | vn rummage-35.5 «NP V PP.location PP.theme»: agent=Agent for sign=Theme |
| 3 | **sign** |  |  | past life |  |  |  |  | nom sign «communication transitive»: of=patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
Craters have the best phone signal

```conllu
# sent_id = question:space:8-mars:t7:o3:1
# text = Craters have the best phone signal
1	Craters	crater	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
4	best	good	ADJ	JJS	Degree=Sup	6	amod	_	_
5	phone	phone	NOUN	NN	Number=Sing	6	compound	_	_
6	signal	signal	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | Craters | the best phone signal |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent signal=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
Craters are the warmest places on Mars

```conllu
# sent_id = question:space:8-mars:t7:o4:1
# text = Craters are the warmest places on Mars
1	Craters	crater	NOUN	NNS	Number=Plur	5	nsubj	_	_
2	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	warmest	warm	ADJ	JJS	Degree=Sup	5	amod	_	_
5	places	place	NOUN	NNS	Number=Plur	0	root	_	_
6	on	on	ADP	IN	_	7	case	_	_
7	Mars	Mars	PROPN	NNP	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Craters | the warmest places |  | Mars |  |  | tree rules |

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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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- ← previous: [Mars, test 6](https://md.mova.elamur.ai/free/en/corpora/questions/space/8-mars/t6/)
- next →: [Mars, test 8](https://md.mova.elamur.ai/free/en/corpora/questions/space/8-mars/t8/)
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