---
title: That is why a moving bike balances and a still one falls over, and w… — Riding a bike: why it stays up · tree and pragmatics
description: That is why a moving bike balances and a still one falls over, and why riding very slowly feels wobbly. Who acts: That, moving bike, one, riding. A sentence of the lesson «Riding a bike: why it stays up» of the physics course of Mova's primary school with its dependency tree and the pragmatics of ev
---

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# Riding a bike: why it stays up, sentence 1

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That is why a moving bike balances and a still one falls over, and why riding very slowly feels wobbly.

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**Who acts:** That, moving bike, one, riding · **What happens:** be, move, balance, fall over, ride, feel

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This is a sentence of the lesson «Riding a bike: why it stays up» 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 (That, moving bike, one, riding), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:009-riding-a-bike.lesson:1
# text = That is why a moving bike balances and a still one falls over, and why riding very slowly feels wobbly.
# source = school lesson (ours)
# course = physics
# lesson = 009-riding-a-bike.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): R5-strong ×2, R6-punct-agree ×1
1	That	that	PRON	DT	Number=Sing|PronType=Dem	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	why	why	ADV	WRB	PronType=Rel	0	root	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
5	moving	move	VERB	VBG	VerbForm=Ger	6	amod	_	_
6	bike	bike	NOUN	NN	Number=Sing	7	nsubj	_	_
7	balances	balance	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	ccomp	_	_
8	and	and	CCONJ	CC	_	12	cc	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	Agree=R5-strong|Haiku=12:det
10	still	still	ADV	RB	_	11	advmod	_	_
11	one	one	NUM	CD	NumForm=Word|NumType=Card	12	nsubj	_	_
12	falls	fall	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	conj	_	_
13	over	over	ADV	RB	_	12	advmod	_	_
14	,	,	PUNCT	,	_	20	punct	_	Agree=R6-punct-agree|Haiku=12:punct
15	and	and	CCONJ	CC	_	20	cc	_	_
16	why	why	ADV	WRB	PronType=Int	20	advmod	_	_
17	riding	ride	VERB	VBG	Tense=Pres|VerbForm=Part	20	csubj	_	_
18	very	very	ADV	RB	_	19	advmod	_	_
19	slowly	slowly	ADV	RB	_	17	advmod	_	Agree=R5-strong|Haiku=20:advmod
20	feels	feel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	conj	_	_
21	wobbly	wobbly	ADJ	JJ	Degree=Pos	20	xcomp	_	_
22	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

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

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | That |  |  |  |  | why *property* | tree rules |
| 2 | **move** | gerund |  |  |  |  |  |  | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 3 | **balance** | present | a moving bike |  |  |  |  |  | vn spatial\_configuration-47.6-1 «NP V»: agent=Theme |
| 4 | **fall over** | present | a one |  |  |  |  | over *property* | vn occur-48.3 «NP V»: agent=Theme |
| 5 | **ride** | gerund |  |  |  |  |  | slowly *property* | vn nonvehicle-51.4.2 «NP.agent V»: agent=Agent |
| 6 | **feel** | present | riding |  |  |  |  | wobbly *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |

<!-- .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:009-riding-a-bike.lesson:1`.

**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): R5-strong ×2, R6-punct-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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- ← previous: [Riding a bike: why it stays up, 0](https://md.mova.elamur.ai/free/en/corpora/school/physics/9-riding-a-bike/0/)
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