---
title: Mercury's surface is covered in craters like the Moon's, and the Cal… — Mercury · tree and pragmatics
description: Mercury's surface is covered in craters like the Moon's, and the Caloris Basin is about 1,500 kilometres across. Who acts: Caloris Basin. A sentence of the lesson «Mercury» of the space course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Mercury, sentence 12

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Mercury's surface is covered in craters like the Moon's, and the Caloris Basin is about 1,500 kilometres across.

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**Who acts:** Caloris Basin · **What happens:** cover, be · **To what, where:** surface, 1,500 kilometres

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This is a sentence of the lesson «Mercury» of the space course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Caloris Basin), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:003-mercury.lesson:12
# text = Mercury's surface is covered in craters like the Moon's, and the Caloris Basin is about 1,500 kilometres across.
# source = school lesson (ours)
# course = space
# lesson = 003-mercury.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	Mercury	Mercury	PROPN	NNP	Number=Sing	3	nmod:poss	_	_
2	's	's	PART	POS	_	1	case	_	_
3	surface	surface	NOUN	NN	Number=Sing	5	nsubj:pass	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	aux:pass	_	_
5	covered	cover	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
6	in	in	ADP	IN	_	7	case	_	_
7	craters	crater	NOUN	NNS	Number=Plur	5	obl	_	_
8	like	like	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	Moon	Moon	PROPN	NNP	Number=Sing	7	nmod	_	_
11	's	's	PART	POS	_	10	case	_	_
12	,	,	PUNCT	,	_	20	punct	_	_
13	and	and	CCONJ	CC	_	20	cc	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	16	det	_	_
15	Caloris	Caloris	PROPN	NNP	Number=Sing	16	compound	_	_
16	Basin	Basin	PROPN	NNP	Number=Sing	20	nsubj	_	_
17	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	cop	_	_
18	about	about	ADV	RB	_	19	advmod	_	_
19	1,500	1,500	NUM	CD	NumForm=Digit|NumType=Card	20	nummod	_	_
20	kilometres	kilometre	NOUN	NNS	Number=Plur	5	conj	_	_
21	across	across	ADV	RB	_	20	advmod	_	_
22	.	.	PUNCT	.	_	5	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cover** | present · passive |  | Mercury's surface |  |  |  | in craters like the Moon | vn fill-9.8-1 «NP V NP PP.theme»: subject=Destination in crater=Theme |
| 2 | **is a** | present | the Caloris Basin | 1,500 kilometres |  |  |  | across *property* | tree rules |

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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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:space:003-mercury.lesson:12`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Mercury, 10](https://md.mova.elamur.ai/free/en/corpora/school/space/3-mercury/10/)
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