---
title: Red-bellied piranhas have razor-sharp triangular teeth but mostly ea… — Rivers, lakes and ponds · tree and pragmatics
description: Red-bellied piranhas have razor-sharp triangular teeth but mostly eat insects, fish, worms and plants, and attacks on people are rare, usually just bites when water is low and food is scarce. Who acts: bellied piranhas, attacks, water, food. A sentence of the lesson «Rivers, lakes and ponds» of the 
---

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# Rivers, lakes and ponds, sentence 13

<!-- .ven lang=en -->
Red-bellied piranhas have razor-sharp triangular teeth but mostly eat insects, fish, worms and plants, and attacks on people are rare, usually just bites when water is low and food is scarce.

<!-- .vintro -->
**Who acts:** bellied piranhas, attacks, water, food · **What happens:** belly, have, eat, be, bite · **To what, where:** razor sharp triangular teeth, insects

<!-- .vabout -->
This is a sentence of the lesson «Rivers, lakes and ponds» of the biology 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 (bellied piranhas, attacks, water, food), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:010-rivers-lakes-and-ponds.lesson:13
# text = Red-bellied piranhas have razor-sharp triangular teeth but mostly eat insects, fish, worms and plants, and attacks on people are rare, usually just bites when water is low and food is scarce.
# source = school lesson (ours)
# course = biology
# lesson = 010-rivers-lakes-and-ponds.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): R7-rel-agree ×1
1	Red	Red	ADJ	JJ	Degree=Pos	3	amod	_	_
2	-	-	PUNCT	HYPH	_	1	punct	_	_
3	bellied	belly	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	amod	_	_
4	piranhas	piranha	NOUN	NNS	Number=Plur	5	nsubj	_	_
5	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	razor	razor	NOUN	NN	Number=Sing	10	compound	_	_
7	-	-	PUNCT	HYPH	_	6	punct	_	_
8	sharp	sharp	ADJ	JJ	Degree=Pos	10	amod	_	_
9	triangular	triangular	ADJ	JJ	Degree=Pos	10	amod	_	_
10	teeth	tooth	NOUN	NNS	Number=Plur	5	obj	_	_
11	but	but	CCONJ	CC	_	13	cc	_	_
12	mostly	mostly	ADV	RB	_	13	advmod	_	_
13	eat	eat	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	conj	_	_
14	insects	insect	NOUN	NNS	Number=Plur	13	obj	_	_
15	,	,	PUNCT	,	_	16	punct	_	_
16	fish	fish	NOUN	NNS	Number=Plur	14	conj	_	Agree=R7-rel-agree|Haiku=14:appos|HaikuPos=NOUN:NN:Number=Sing
17	,	,	PUNCT	,	_	18	punct	_	_
18	worms	worm	NOUN	NNS	Number=Plur	14	conj	_	_
19	and	and	CCONJ	CC	_	20	cc	_	_
20	plants	plant	NOUN	NNS	Number=Plur	14	conj	_	_
21	,	,	PUNCT	,	_	27	punct	_	_
22	and	and	CCONJ	CC	_	27	cc	_	_
23	attacks	attack	NOUN	NNS	Number=Plur	27	nsubj	_	_
24	on	on	ADP	IN	_	25	case	_	_
25	people	people	NOUN	NNS	Number=Plur	23	nmod	_	_
26	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	27	cop	_	_
27	rare	rare	ADJ	JJ	Degree=Pos	5	conj	_	_
28	,	,	PUNCT	,	_	31	punct	_	_
29	usually	usually	ADV	RB	_	31	advmod	_	_
30	just	just	ADV	RB	_	31	advmod	_	_
31	bites	bite	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	parataxis	_	_
32	when	when	ADV	WRB	PronType=Int	35	advmod	_	_
33	water	water	NOUN	NN	Number=Sing	35	nsubj	_	_
34	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	35	cop	_	_
35	low	low	ADJ	JJ	Degree=Pos	31	advcl	_	_
36	and	and	CCONJ	CC	_	39	cc	_	_
37	food	food	NOUN	NN	Number=Sing	39	nsubj	_	_
38	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	39	cop	_	_
39	scarce	scarce	ADJ	JJ	Degree=Pos	35	conj	_	_
40	.	.	PUNCT	.	_	5	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **belly** | participle |  |  |  |  |  |  | tree rules |
| 2 | **have** | present | bellied piranhas | razor sharp triangular teeth |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent tooth=Patient |
| 3 | **eat** | present | bellied piranhas *not said here* | insects and fish and worms and plants |  |  |  | mostly *property* | vn eat-39.1-1 «NP V NP»: agent=Agent insect=Patient |
| 4 | **is** | present | attacks on people |  |  |  |  | rare *property* | tree rules |
| 5 | **bite** | present |  |  |  |  |  | usually *property* | vn swat-18.2 «NP V PP»: agent=Agent |
| 6 | **is** | present | water |  |  |  |  | low *property* | tree rules |
| 7 | **is** | present | food |  |  |  |  | scarce *property* | 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:biology:010-rivers-lakes-and-ponds.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): R7-rel-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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