---
title: A few houseplants do very little to clean the air of a room; opening… — The air we breathe · tree and pragmatics
description: A few houseplants do very little to clean the air of a room; opening a window does far more. A sentence of the lesson «The air we breathe» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# The air we breathe, sentence 17

<!-- .ven lang=en -->
A few houseplants do very little to clean the air of a room; opening a window does far more.

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**What happens:** clean, open · **To what, where:** air, window

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This is a sentence of the lesson «The air we breathe» 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: what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:033-the-air-we-breathe.lesson:17
# text = A few houseplants do very little to clean the air of a room; opening a window does far more.
# source = school lesson (ours)
# course = chemistry
# lesson = 033-the-air-we-breathe.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	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	few	few	ADJ	JJ	Degree=Pos	3	amod	_	_
3	houseplants	houseplant	NOUN	NNS	Number=Plur	4	nsubj	_	Agree=R5-strong|Haiku=6:nsubj
4	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	aux	_	_
5	very	very	ADV	RB	_	6	advmod	_	_
6	little	little	ADJ	JJ	Degree=Pos	0	root	_	_
7	to	to	PART	TO	_	8	mark	_	_
8	clean	clean	VERB	VB	VerbForm=Inf	6	advcl	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	air	air	NOUN	NN	Number=Sing	8	obj	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
13	room	room	NOUN	NN	Number=Sing	10	nmod	_	_
14	;	;	PUNCT	,	_	20	punct	_	_
15	opening	open	VERB	VBG	VerbForm=Ger	18	csubj	_	Agree=R5-strong|Haiku=20:csubj
16	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	_	_
17	window	window	NOUN	NN	Number=Sing	15	obj	_	_
18	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	aux	_	_
19	far	far	ADV	RB	Degree=Pos	20	advmod	_	_
20	more	more	ADJ	JJR	Degree=Cmp	6	conj	_	_
21	.	.	PUNCT	.	_	4	punct	_	Agree=R6-punct-agree|Haiku=6: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 | **clean** | to-infinitive |  | the air of a room |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent air=Patient |
| 2 | **open** | gerund |  | a window |  |  |  |  | vn spatial\_configuration-47.6-1 «PP.location V NP»: agent=Location window=Theme |

<!-- .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:chemistry:033-the-air-we-breathe.lesson:17`.

**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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