---
title: why do we only ever see one side of the moon — Thinking like an astronomer · tree and pragmatics
description: why do we only ever see one side of the moon Test 10 · ★★★ of lesson 10 «Thinking like an astronomer» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t10/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [questions](https://md.mova.elamur.ai/free/en/corpora/questions/) / [World](https://md.mova.elamur.ai/free/en/corpora/questions/world/) / [Thinking like an astronomer](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/) / t10

# Test 10 · ★★★ · Thinking like an astronomer

<!-- .ven lang=en -->
why do we only ever see one side of the moon

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 3 · wrong ✗ · **Who acts:** we · **What happens:** see · **To what, where:** one side

<!-- .vabout -->
This is test 10 · ★★★ of lesson 10 «Thinking like an astronomer» of the world 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/world/10-reasoning-about-space/#t10).

## The question {#question}

```conllu
# sent_id = question:world:10-reasoning-about-space:t10:1
# text = why do we only ever see one side of the moon
1	why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	6	aux	_	_
3	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	6	nsubj	_	_
4	only	only	ADV	RB	_	6	advmod	_	_
5	ever	ever	ADV	RB	PronType=Ind	6	advmod	_	_
6	see	see	VERB	VB	VerbForm=Inf	0	root	_	_
7	one	one	NUM	CD	NumForm=Word|NumType=Card	8	nummod	_	_
8	side	side	NOUN	NN	Number=Sing	6	obj	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	moon	moon	NOUN	NN	Number=Sing	8	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **see** | present · do-support | we | one side of the moon |  |  | ever |  | vn comprehend-87.2-1-1 «NP V NP»: agent=Experiencer side=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.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The other side is always in the dark

```conllu
# sent_id = question:world:10-reasoning-about-space:t10:o1:1
# text = The other side is always in the dark
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	other	other	ADJ	JJ	Degree=Pos	3	amod	_	_
3	side	side	NOUN	NN	Number=Sing	8	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	cop	_	_
5	always	always	ADV	RB	PronType=Tot	8	advmod	_	_
6	in	in	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	dark	dark	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the other side |  |  | the dark |  | always *property* | tree rules |

### Option 2 · ← Mova's choice {#o2}

<!-- .ven lang=en -->
The Earth blocks our view of the far side

```conllu
# sent_id = question:world:10-reasoning-about-space:t10:o2:1
# text = The Earth blocks our view of the far side
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Earth	Earth	PROPN	NNP	Number=Sing	3	nsubj	_	_
3	blocks	block	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	our	our	PRON	PRP$	Case=Gen|Number=Plur|Person=1|Poss=Yes|PronType=Prs	5	nmod:poss	_	_
5	view	view	NOUN	NN	Number=Sing	3	obj	_	_
6	of	of	ADP	IN	_	9	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	far	far	ADJ	JJ	Degree=Pos	9	amod	_	_
9	side	side	NOUN	NN	Number=Sing	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **block** | present | the Earth | our view of the far side |  |  |  |  | vn forbid-64.4-1 «NP V NP»: agent=Causer view=Theme |
| 2 | **view** |  | our | the far side |  |  |  |  | nom view «cognition transitive»: poss=agent of=patient |

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

<!-- .ven lang=en -->
It turns once in the same time it goes round us

```conllu
# sent_id = question:world:10-reasoning-about-space:t10:o3:1
# text = It turns once in the same time it goes round us
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	turns	turn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	once	once	ADV	RB	NumForm=Word|NumType=Mult	2	advmod	_	_
4	in	in	ADP	IN	_	7	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	same	same	ADJ	JJ	Degree=Pos	7	amod	_	_
7	time	time	NOUN	NN	Number=Sing	2	obl	_	_
8	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
9	goes	go	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	acl:relcl	_	_
10	round	round	ADV	RB	_	9	advmod	_	_
11	us	we	PRON	PRP	Case=Acc|Number=Plur|Person=1|PronType=Prs	9	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | present | It |  |  |  | time | once *property* | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 2 | **go round** | present | it | us |  |  |  | round *property* | vn meander-47.7 «PP.location V NP»: agent=Location time=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The Moon doesn't turn at all

```conllu
# sent_id = question:world:10-reasoning-about-space:t10:o4:1
# text = The Moon doesn't turn at all
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Moon	Moon	PROPN	NNP	Number=Sing	5	nsubj	_	_
3	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	aux	_	SpaceAfter=No
4	n't	not	PART	RB	Polarity=Neg	5	advmod	_	_
5	turn	turn	VERB	VB	VerbForm=Inf	0	root	_	_
6	at	at	ADP	IN	_	7	case	_	_
7	all	all	DET	DT	PronType=Tot	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **turn** | present · do-support | the Moon |  |  | all |  |  | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme at all=Trajectory |

<!-- div src -->

**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 -->

<!-- pn -->
- ← previous: [Thinking like an astronomer, test 9](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t9/)
- next →: [Thinking like an astronomer, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t11/)
- ↑ back to [Thinking like an astronomer](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/)