---
title: Ganymede is the only moon known to have its own magnetic field. — Jupiter's moons · tree and pragmatics
description: Ganymede is the only moon known to have its own magnetic field. Who acts: Ganymede. A sentence of the lesson «Jupiter's moons» of the space course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Jupiter's moons, sentence 12

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Ganymede is the only moon known to have its own magnetic field.

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**Who acts:** Ganymede · **What happens:** be, know, have · **To what, where:** only moon, own magnetic field

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This is a sentence of the lesson «Jupiter's moons» 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 (Ganymede), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:011-jupiters-moons.lesson:12
# text = Ganymede is the only moon known to have its own magnetic field.
# source = school lesson (ours)
# course = space
# lesson = 011-jupiters-moons.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	Ganymede	Ganymede	PROPN	NNP	Number=Sing	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	only	only	ADJ	JJ	Degree=Pos	5	amod	_	_
5	moon	moon	NOUN	NN	Number=Sing	0	root	_	_
6	known	know	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	acl	_	_
7	to	to	PART	TO	_	8	mark	_	_
8	have	have	VERB	VB	VerbForm=Inf	6	xcomp	_	_
9	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	12	nmod:poss	_	_
10	own	own	ADJ	JJ	Degree=Pos	12	amod	_	_
11	magnetic	magnetic	ADJ	JJ	Degree=Pos	12	amod	_	_
12	field	field	NOUN	NN	Number=Sing	8	obj	_	_
13	.	.	PUNCT	.	_	5	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Ganymede | the only moon |  |  |  |  | tree rules |
| 2 | **know** | participle |  | the only moon *not said here* |  |  |  |  | vn comprehend-87.2-1-1-1 «NP V how S\_INF»: agent=Experiencer clause=Stimulus |
| 3 | **have** | to-infinitive |  | System's own magnetic field |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent field=Patient |

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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:011-jupiters-moons.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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