---
title: Squashed air pushes back hard, which is how bike tyres and footballs… — Solids, liquids and gases · tree and pragmatics
description: Squashed air pushes back hard, which is how bike tyres and footballs work. Who acts: Squashed air. A sentence of the lesson «Solids, liquids and gases» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Solids, liquids and gases, sentence 8

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Squashed air pushes back hard, which is how bike tyres and footballs work.

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**Who acts:** Squashed air · **What happens:** squash back, push, be

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This is a sentence of the lesson «Solids, liquids and gases» of the chemistry 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 (Squashed air), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:004-solids-liquids-and-gases.lesson:8
# text = Squashed air pushes back hard, which is how bike tyres and footballs work.
# source = school lesson (ours)
# course = chemistry
# lesson = 004-solids-liquids-and-gases.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 ×1
1	Squashed	squash	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	amod	_	_
2	air	air	NOUN	NN	Number=Sing	3	nsubj	_	_
3	pushes	push	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	back	back	ADV	RB	_	1	advmod	_	_
5	hard	hard	ADV	RB	Degree=Pos	3	advmod	_	Agree=R5-strong|Haiku=1:advmod
6	,	,	PUNCT	,	_	14	punct	_	_
7	which	which	PRON	WDT	PronType=Rel	14	nsubj	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	cop	_	_
9	how	how	ADV	WRB	PronType=Int	14	advmod	_	_
10	bike	bike	NOUN	NN	Number=Sing	11	compound	_	_
11	tyres	tyre	NOUN	NNS	Number=Plur	14	nsubj	_	_
12	and	and	CCONJ	CC	_	13	cc	_	_
13	footballs	football	NOUN	NNS	Number=Plur	11	conj	_	_
14	work	work	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	3	acl:relcl	_	_
15	.	.	PUNCT	.	_	1	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 | **squash back** | participle |  |  |  |  |  |  | vn bump-18.4-1 «NP V together»: agent=Theme |
| 2 | **push** | present | Squashed air |  |  |  |  | hard *property* | vn push-12-1-1 «NP V PP»: agent=Agent |
| 3 | **is** | present |  |  |  |  |  | work *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:chemistry:004-solids-liquids-and-gases.lesson:8`.

**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 ×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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