---
title: Tipping back on chairs is a common cause of head injuries in classro… — Classroom rules and homework · tree and pragmatics
description: Tipping back on chairs is a common cause of head injuries in classrooms. Who acts: Tipping. A sentence of the lesson «Classroom rules and homework» of the everyday course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Classroom rules and homework, sentence 22

<!-- .ven lang=en -->
Tipping back on chairs is a common cause of head injuries in classrooms.

<!-- .vintro -->
**Who acts:** Tipping · **What happens:** tip back, be · **To what, where:** chairs, common cause

<!-- .vabout -->
This is a sentence of the lesson «Classroom rules and homework» of the everyday 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 (Tipping), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:everyday:254-classroom-rules-and-homework.lesson:22
# text = Tipping back on chairs is a common cause of head injuries in classrooms.
# source = school lesson (ours)
# course = everyday
# lesson = 254-classroom-rules-and-homework.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	Tipping	tip	VERB	VBG	VerbForm=Ger	8	csubj	_	_
2	back	back	ADV	RB	_	1	advmod	_	_
3	on	on	ADP	IN	_	4	case	_	_
4	chairs	chair	NOUN	NNS	Number=Plur	1	obl	_	_
5	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	cop	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	common	common	ADJ	JJ	Degree=Pos	8	amod	_	_
8	cause	cause	NOUN	NN	Number=Sing	0	root	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	head	head	NOUN	NN	Number=Sing	11	compound	_	_
11	injuries	injury	NOUN	NNS	Number=Plur	8	nmod	_	_
12	in	in	ADP	IN	_	13	case	_	_
13	classrooms	classroom	NOUN	NNS	Number=Plur	11	nmod	_	_
14	.	.	PUNCT	.	_	8	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 | **tip back** | gerund |  |  |  | chairs |  |  | vn throw-17.1-1-1 «NP V NP PP.destinations»: agent=Agent on chair=Destination |
| 2 | **is a** | present | Tipping | a common cause |  |  |  | of head injuries in classrooms | tree rules |

<!-- .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:everyday:254-classroom-rules-and-homework.lesson:22`.

**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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