---
title: Down feathers trap air and keep a bird warm. — Birds: feathers, nests and flight · tree and pragmatics
description: Down feathers trap air and keep a bird warm. Who acts: Down feathers. A sentence of the lesson «Birds: feathers, nests and flight» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Birds: feathers, nests and flight, sentence 8

<!-- .ven lang=en -->
Down feathers trap air and keep a bird warm.

<!-- .vintro -->
**Who acts:** Down feathers · **What happens:** trap, keep · **To what, where:** air, bird

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This is a sentence of the lesson «Birds: feathers, nests and flight» 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 (Down feathers), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:073-birds-feathers-nests-flight.lesson:8
# text = Down feathers trap air and keep a bird warm.
# source = school lesson (ours)
# course = world
# lesson = 073-birds-feathers-nests-flight.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	Down	down	NOUN	NN	_	2	compound	_	_
2	feathers	feather	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	trap	trap	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	air	air	NOUN	NN	Number=Sing	3	obj	_	_
5	and	and	CCONJ	CC	_	6	cc	_	_
6	keep	keep	VERB	VB	VerbForm=Inf	3	conj	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	bird	bird	NOUN	NN	Number=Sing	6	obj	_	_
9	warm	warm	ADJ	JJ	Degree=Pos	6	xcomp	_	_
10	.	.	PUNCT	.	_	3	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 | **trap** | present | Down feathers | air |  |  |  |  | vn trick-59.2 «NP V NP»: agent=Agent air=Patient |
| 2 | **keep** | infinitive | Down feathers *not said here* | a bird |  |  |  | warm *property* | vn keep-15.2 «NP V NP»: agent=Agent bird=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:world:073-birds-feathers-nests-flight.lesson:8`.

**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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