---
title: Standing on one leg, you keep moving to keep your centre of gravity… — Balance: the centre of gravity · tree and pragmatics
description: Standing on one leg, you keep moving to keep your centre of gravity over your foot, and with your eyes shut it gets much harder. Who acts: you, centre. A sentence of the lesson «Balance: the centre of gravity» of the physics course of Mova's primary school with its dependency tree and the pragmatics
---

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# Balance: the centre of gravity, sentence 6

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Standing on one leg, you keep moving to keep your centre of gravity over your foot, and with your eyes shut it gets much harder.

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**Who acts:** you, centre · **What happens:** stand, keep, move, get · **To what, where:** one leg, centre, foot

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This is a sentence of the lesson «Balance: the centre of gravity» 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 (you, centre), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:008-balance-the-centre-of-gravity.lesson:6
# text = Standing on one leg, you keep moving to keep your centre of gravity over your foot, and with your eyes shut it gets much harder.
# source = school lesson (ours)
# course = physics
# lesson = 008-balance-the-centre-of-gravity.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	Standing	stand	VERB	VBG	Tense=Pres|VerbForm=Part	7	advcl	_	_
2	on	on	ADP	IN	_	4	case	_	_
3	one	one	NUM	CD	NumForm=Word|NumType=Card	4	nummod	_	_
4	leg	leg	NOUN	NN	Number=Sing	1	obl	_	_
5	,	,	PUNCT	,	_	1	punct	_	_
6	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	7	nsubj	_	_
7	keep	keep	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	_	_
8	moving	move	VERB	VBG	Tense=Pres|VerbForm=Part	7	xcomp	_	_
9	to	to	PART	TO	_	10	mark	_	_
10	keep	keep	VERB	VB	VerbForm=Inf	8	advcl	_	_
11	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	12	nmod:poss	_	_
12	centre	centre	NOUN	NN	Number=Sing	10	obj	_	_
13	of	of	ADP	IN	_	14	case	_	_
14	gravity	gravity	NOUN	NN	Number=Sing	12	nmod	_	_
15	over	over	ADP	IN	_	17	case	_	_
16	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	17	nmod:poss	_	_
17	foot	foot	NOUN	NN	Number=Sing	10	obl	_	_
18	,	,	PUNCT	,	_	25	punct	_	_
19	and	and	CCONJ	CC	_	25	cc	_	_
20	with	with	ADP	IN	_	22	case	_	_
21	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	22	nmod:poss	_	_
22	eyes	eye	NOUN	NNS	Number=Plur	25	obl	_	_
23	shut	shut	ADJ	JJ	Degree=Pos	22	amod	_	_
24	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	25	nsubj	_	_
25	gets	get	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	conj	_	_
26	much	much	ADV	RB	_	27	advmod	_	_
27	harder	hard	ADJ	JJR	Degree=Cmp	25	xcomp	_	_
28	.	.	PUNCT	.	_	7	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 | **stand** | gerund | you *not said here* |  |  | one leg |  |  | vn assuming\_position-50 «NP V PP.location»: agent=Agent on leg=Location |
| 2 | **keep** | present | you |  |  |  |  |  | tree rules |
| 3 | **move** | gerund | you *not said here* |  |  |  |  |  | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 4 | **keep** | to-infinitive | you *not said here* | your centre of gravity |  | your foot |  |  | vn keep-15.2 «NP V NP PP.location»: agent=Agent centre=Theme over foot=Location |
| 5 | **get** | present | centre |  |  |  |  | with your eyes; hard *property* | vn comprehend-87.2-1 «NP V S\_ING»: agent=Experiencer |

<!-- .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.

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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:008-balance-the-centre-of-gravity.lesson:6`.

**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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