---
title: Freshwater mussels filter and clean river water as they feed, pearl… — Rivers, lakes and ponds · tree and pragmatics
description: Freshwater mussels filter and clean river water as they feed, pearl mussels can live over 100 years, and their babies spend their first months on the gills of salmon or trout. Who acts: Freshwater mussels, mussels, pearl mussels, babies. A sentence of the lesson «Rivers, lakes and ponds» of the biol
---

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# Rivers, lakes and ponds, sentence 16

<!-- .ven lang=en -->
Freshwater mussels filter and clean river water as they feed, pearl mussels can live over 100 years, and their babies spend their first months on the gills of salmon or trout.

<!-- .vintro -->
**Who acts:** Freshwater mussels, mussels, pearl mussels, babies · **What happens:** filter, clean, feed, live, spend · **To what, where:** river water, gills

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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 (Freshwater mussels, mussels, pearl mussels, babies), 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:16
# text = Freshwater mussels filter and clean river water as they feed, pearl mussels can live over 100 years, and their babies spend their first months on the gills of salmon or trout.
# 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): R5-strong ×2, R6-punct-agree ×1
1	Freshwater	freshwater	NOUN	NN	Number=Sing	2	compound	_	_
2	mussels	mussel	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	filter	filter	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	Agree=R5-strong|Haiku=15:conj
4	and	and	CCONJ	CC	_	5	cc	_	_
5	clean	clean	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
6	river	river	NOUN	NN	Number=Sing	7	compound	_	_
7	water	water	NOUN	NN	Number=Sing	5	obj	_	_
8	as	as	SCONJ	IN	_	10	mark	_	_
9	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	10	nsubj	_	_
10	feed	feed	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	15	advcl	_	_
11	,	,	PUNCT	,	_	10	punct	_	_
12	pearl	pearl	NOUN	NN	Number=Sing	13	compound	_	_
13	mussels	mussel	NOUN	NNS	Number=Plur	15	nsubj	_	_
14	can	can	AUX	MD	VerbForm=Fin	15	aux	_	_
15	live	live	VERB	VB	VerbForm=Inf	3	parataxis	_	Agree=R5-strong|Haiku=0:root
16	over	over	ADP	IN	_	18	case	_	_
17	100	100	NUM	CD	NumForm=Digit|NumType=Card	18	nummod	_	_
18	years	year	NOUN	NNS	Number=Plur	15	obl	_	_
19	,	,	PUNCT	,	_	23	punct	_	_
20	and	and	CCONJ	CC	_	23	cc	_	_
21	their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	22	nmod:poss	_	_
22	babies	baby	NOUN	NNS	Number=Plur	23	nsubj	_	_
23	spend	spend	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	15	parataxis	_	_
24	their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	26	nmod:poss	_	_
25	first	first	ADJ	JJ	Degree=Pos|NumForm=Word|NumType=Ord	26	amod	_	_
26	months	month	NOUN	NNS	Number=Plur	23	obj	_	_
27	on	on	ADP	IN	_	29	case	_	_
28	the	the	DET	DT	Definite=Def|PronType=Art	29	det	_	_
29	gills	gill	NOUN	NNS	Number=Plur	23	obl	_	_
30	of	of	ADP	IN	_	31	case	_	_
31	salmon	salmon	NOUN	NN	Number=Sing	29	nmod	_	_
32	or	or	CCONJ	CC	_	33	cc	_	_
33	trout	trout	NOUN	NN	Number=Sing	31	conj	_	_
34	.	.	PUNCT	.	_	3	punct	_	Agree=R6-punct-agree|Haiku=15: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 | **filter** | present | Freshwater mussels |  |  |  |  |  | vn wipe\_instr-10.4.2 «NP.agent V»: agent=Agent |
| 2 | **clean** | present | Freshwater mussels *not said here* | river water |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent water=Patient |
| 3 | **feed** | present | mussels *= mussel* |  |  |  |  |  | vn gorge-39.6 «NP V PP.patient»: agent=Agent |
| 4 | **live** | can | pearl mussels |  |  |  | year |  | vn exist-47.1-1 «NP V»: agent=Theme |
| 5 | **spend** | present | mussels's babies |  |  |  | month | on the gills of salmon or trout *goal* | vn consume-66-1 «NP V NP S\_ING»: agent=Agent on gill=Goal |

<!-- .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: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): 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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