---
title: Compression is a force that squashes; tension is a force that stretc… — Building strong things: bridges, towers and shapes · tree and pragmatics
description: Compression is a force that squashes; tension is a force that stretches. Who acts: Compression, force, tension. A sentence of the lesson «Building strong things: bridges, towers and shapes» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Building strong things: bridges, towers and shapes, sentence 16

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Compression is a force that squashes; tension is a force that stretches.

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**Who acts:** Compression, force, tension · **What happens:** be, squash, stretch · **To what, where:** force

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This is a sentence of the lesson «Building strong things: bridges, towers and shapes» of the world 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 (Compression, force, tension), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:086-building-strong-things.lesson:16
# text = Compression is a force that squashes; tension is a force that stretches.
# source = school lesson (ours)
# course = world
# lesson = 086-building-strong-things.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	Compression	compression	NOUN	NN	Number=Sing	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	force	force	NOUN	NN	Number=Sing	0	root	_	_
5	that	that	PRON	WDT	PronType=Rel	6	nsubj	_	_
6	squashes	squash	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	acl:relcl	_	_
7	;	;	PUNCT	:	_	6	punct	_	_
8	tension	tension	NOUN	NN	Number=Sing	11	nsubj	_	_
9	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	cop	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
11	force	force	NOUN	NN	Number=Sing	4	parataxis	_	_
12	that	that	PRON	WDT	PronType=Rel	13	nsubj	_	_
13	stretches	stretch	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	acl:relcl	_	_
14	.	.	PUNCT	.	_	4	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 | Compression | a force |  |  |  |  | tree rules |
| 2 | **squash** | present | a force |  |  |  |  |  | vn bump-18.4-1 «NP V together»: agent=Theme |
| 3 | **is a** | present | tension | a force |  |  |  |  | tree rules |
| 4 | **stretch** | present | a force |  |  |  |  |  | vn bend-45.2 «NP.patient V»: agent=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:world:086-building-strong-things.lesson:16`.

**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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