---
title: A compass needle is a small magnet free to turn, and it lines up wit… — Compasses and the magnetic Earth · tree and pragmatics
description: A compass needle is a small magnet free to turn, and it lines up with the Earth's magnetic field. Who acts: compass needle, needle. A sentence of the lesson «Compasses and the magnetic Earth» of the physics course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Compasses and the magnetic Earth, sentence 5

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A compass needle is a small magnet free to turn, and it lines up with the Earth's magnetic field.

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**Who acts:** compass needle, needle · **What happens:** be, turn, line up · **To what, where:** small magnet

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This is a sentence of the lesson «Compasses and the magnetic Earth» of the physics 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 (compass needle, needle), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:030-compasses-and-the-magnetic-earth.lesson:5
# text = A compass needle is a small magnet free to turn, and it lines up with the Earth's magnetic field.
# source = school lesson (ours)
# course = physics
# lesson = 030-compasses-and-the-magnetic-earth.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): R7-rel-agree ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	compass	compass	NOUN	NN	Number=Sing	3	compound	_	_
3	needle	needle	NOUN	NN	Number=Sing	7	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	small	small	ADJ	JJ	Degree=Pos	7	amod	_	_
7	magnet	magnet	NOUN	NN	Number=Sing	0	root	_	_
8	free	free	ADJ	JJ	Degree=Pos	7	amod	_	_
9	to	to	PART	TO	_	10	mark	_	_
10	turn	turn	VERB	VB	VerbForm=Inf	8	advcl	_	Agree=R7-rel-agree|Haiku=8:xcomp
11	,	,	PUNCT	,	_	14	punct	_	_
12	and	and	CCONJ	CC	_	14	cc	_	_
13	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	14	nsubj	_	_
14	lines	line	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	conj	_	_
15	up	up	ADP	RP	_	14	compound:prt	_	_
16	with	with	ADP	IN	_	21	case	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	Earth	Earth	PROPN	NNP	Number=Sing	21	nmod:poss	_	_
19	's	's	PART	POS	_	18	case	_	_
20	magnetic	magnetic	ADJ	JJ	Degree=Pos	21	amod	_	_
21	field	field	NOUN	NN	Number=Sing	14	obl	_	_
22	.	.	PUNCT	.	_	7	punct	_	_
```

## Pragmatics {#pragmatics}

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

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | a compass needle | a small magnet |  |  |  |  | tree rules |
| 2 | **turn** | to-infinitive | a compass needle *not said here* |  |  |  |  |  | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 3 | **line up** | present | needle |  |  |  |  | with the Earth's magnetic field | vn fill-9.8-1 «NP V NP»: agent=Theme |

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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:physics:030-compasses-and-the-magnetic-earth.lesson:5`.

**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): R7-rel-agree ×1. **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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