---
title: Predators help keep a habitat healthy by stopping plant-eaters from… — Balance in a food web · tree and pragmatics
description: Predators help keep a habitat healthy by stopping plant-eaters from growing too many. Who acts: Predators. A sentence of the lesson «Balance in a food web» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Balance in a food web, sentence 13

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Predators help keep a habitat healthy by stopping plant-eaters from growing too many.

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**Who acts:** Predators · **What happens:** help, keep, stop, grow · **To what, where:** habitat, plant eaters, many

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This is a sentence of the lesson «Balance in a food web» 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 (Predators), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:030-balance-in-food-webs.lesson:13
# text = Predators help keep a habitat healthy by stopping plant-eaters from growing too many.
# source = school lesson (ours)
# course = world
# lesson = 030-balance-in-food-webs.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	Predators	predator	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	help	help	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	keep	keep	VERB	VB	VerbForm=Inf	2	xcomp	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
5	habitat	habitat	NOUN	NN	Number=Sing	3	obj	_	_
6	healthy	healthy	ADJ	JJ	Degree=Pos	3	xcomp	_	_
7	by	by	SCONJ	IN	_	8	mark	_	_
8	stopping	stop	VERB	VBG	Tense=Pres|VerbForm=Part	3	advcl	_	_
9	plant	plant	NOUN	NN	Number=Sing	11	compound	_	_
10	-	-	PUNCT	HYPH	_	9	punct	_	_
11	eaters	eater	NOUN	NNS	Number=Plur	8	obj	_	_
12	from	from	SCONJ	IN	_	13	mark	_	_
13	growing	grow	VERB	VBG	Tense=Pres|VerbForm=Part	8	advcl	_	_
14	too	too	ADV	RB	_	15	advmod	_	_
15	many	many	ADJ	JJ	Degree=Pos	13	obj	_	_
16	.	.	PUNCT	.	_	2	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 | **help** | present | Predators |  |  |  |  |  | vn help-72.1-1-1 «NP V NP S\_INF»: agent=Agent clause=Theme |
| 2 | **keep** | infinitive | Predators *not said here* | a habitat |  |  |  | healthy *property* | vn keep-15.2 «NP V NP»: agent=Agent habitat=Theme |
| 3 | **stop** | gerund | Predators *not said here* | plant eaters |  |  |  |  | vn stop-55.4-1-1 «NP V NP.eventuality»: agent=Subeventuality eater=Eventuality |
| 4 | **grow** | gerund | Predators *not said here* | many |  |  |  |  | vn appear-48.1.1 «PP.location V NP»: agent=Location many=Theme |

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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:030-balance-in-food-webs.lesson:13`.

**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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- ← previous: [Balance in a food web, 12](https://md.mova.elamur.ai/free/en/corpora/school/world/30-balance-in-food-webs/12/)
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