---
title: Ascertain the number of persons who walked upon the surface of the M… — The history of space exploration · tree and pragmatics
description: Ascertain the number of persons who walked upon the surface of the Moon between 1969 and 1972. Exam question 3 of lesson 29 «The history of space exploration» 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 r
---

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# Exam question 3 · The history of space exploration

<!-- .ven lang=en -->
Ascertain the number of persons who walked upon the surface of the Moon between 1969 and 1972.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you, persons · **What happens:** ascertain, walk · **To what, where:** number, surface

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This is exam question 3 of lesson 29 «The history of space exploration» of the space course of Mova's primary school, asked in stiff, formal language. 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/29-the-history-of-space-exploration/#e3).

## The question {#question}

```conllu
# sent_id = question:space:29-the-history-of-space-exploration:e3:1
# text = Ascertain the number of persons who walked upon the surface of the Moon between 1969 and 1972.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	number	number	NOUN	NN	Number=Sing	1	obj	_	_
4	of	of	ADP	IN	_	5	case	_	_
5	persons	person	NOUN	NNS	Number=Plur	3	nmod	_	_
6	who	who	PRON	WP	PronType=Rel	7	nsubj	_	_
7	walked	walk	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	5	acl:relcl	_	_
8	upon	upon	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	surface	surface	NOUN	NN	Number=Sing	7	obl	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	13	det	_	_
13	Moon	Moon	PROPN	NNP	Number=Sing	10	nmod	_	_
14	between	between	ADP	IN	_	15	case	_	_
15	1969	1969	NUM	CD	NumForm=Digit|NumType=Card	7	obl	_	_
16	and	and	CCONJ	CC	_	17	cc	_	_
17	1972	1972	NUM	CD	NumForm=Digit|NumType=Card	15	conj	_	SpaceAfter=No
18	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the number of persons |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent number=Topic |
| 2 | **walk** | past | persons |  |  | the surface of the Moon |  | between 1969 | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme upon surface=Trajectory |

<!-- .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 -->
Twelve

```conllu
# sent_id = question:space:29-the-history-of-space-exploration:e3:o1:1
# text = Twelve
1	Twelve	twelve	NUM	CD	NumForm=Word|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
Twenty

```conllu
# sent_id = question:space:29-the-history-of-space-exploration:e3:o2:1
# text = Twenty
1	Twenty	twenty	NUM	CD	NumForm=Word|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
Two

```conllu
# sent_id = question:space:29-the-history-of-space-exploration:e3:o3:1
# text = Two
1	Two	two	NUM	CD	NumForm=Word|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
Six

```conllu
# sent_id = question:space:29-the-history-of-space-exploration:e3:o4:1
# text = Six
1	Six	six	NUM	CD	NumForm=Word|NumType=Card	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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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: [The history of space exploration, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/space/29-the-history-of-space-exploration/e2/)
- next →: [The history of space exploration, exam 4](https://md.mova.elamur.ai/free/en/corpora/questions/space/29-the-history-of-space-exploration/e4/)
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