---
title: Turbulence is bumpy air, like waves in the sky; planes are built to… — Why planes fly · tree and pragmatics
description: Turbulence is bumpy air, like waves in the sky; planes are built to handle much worse, and the wings bend upwards a lot in flight on purpose. Who acts: Turbulence, wings. A sentence of the lesson «Why planes fly» of the technology course of Mova's primary school with its dependency tree and the prag
---

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# Why planes fly, sentence 12

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Turbulence is bumpy air, like waves in the sky; planes are built to handle much worse, and the wings bend upwards a lot in flight on purpose.

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**Who acts:** Turbulence, wings · **What happens:** be, build, handle, bend · **To what, where:** bumpy air, planes, lot, flight

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This is a sentence of the lesson «Why planes fly» of the technology 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 (Turbulence, wings), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:technology:022-why-planes-fly.lesson:12
# text = Turbulence is bumpy air, like waves in the sky; planes are built to handle much worse, and the wings bend upwards a lot in flight on purpose.
# source = school lesson (ours)
# course = technology
# lesson = 022-why-planes-fly.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): R2-punct-next ×1, R5-strong ×1, R7-rel-agree ×2
1	Turbulence	turbulence	NOUN	NN	Number=Sing	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	bumpy	bumpy	ADJ	JJ	Degree=Pos	4	amod	_	_
4	air	air	NOUN	NN	Number=Sing	0	root	_	_
5	,	,	PUNCT	,	_	14	punct	_	_
6	like	like	ADP	IN	_	7	case	_	_
7	waves	wave	NOUN	NNS	Number=Plur	4	obl	_	Agree=R7-rel-agree|Haiku=4:nmod
8	in	in	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	sky	sky	NOUN	NN	Number=Sing	7	nmod	_	_
11	;	;	PUNCT	,	_	12	punct	_	_
12	planes	plane	NOUN	NNS	Number=Plur	14	nsubj:pass	_	_
13	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	14	aux:pass	_	_
14	built	build	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	parataxis	_	_
15	to	to	PART	TO	_	16	mark	_	_
16	handle	handle	VERB	VB	VerbForm=Inf	14	xcomp	_	_
17	much	much	ADV	RB	_	18	advmod	_	_
18	worse	bad	ADJ	JJR	Degree=Cmp	16	advmod	_	Agree=R7-rel-agree|Haiku=16:obj
19	,	,	PUNCT	,	_	23	punct	_	Agree=R2-punct-next|Haiku=14:punct
20	and	and	CCONJ	CC	_	23	cc	_	_
21	the	the	DET	DT	Definite=Def|PronType=Art	22	det	_	_
22	wings	wing	NOUN	NNS	Number=Plur	23	nsubj	_	_
23	bend	bend	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	14	conj	_	_
24	upwards	upward	ADV	RB	_	23	advmod	_	_
25	a	a	DET	DT	Definite=Ind|PronType=Art	26	det	_	_
26	lot	lot	NOUN	NN	Number=Sing	23	obl:unmarked	_	_
27	in	in	ADP	IN	_	28	case	_	_
28	flight	flight	NOUN	NN	Number=Sing	23	obl	_	Agree=R5-strong|Haiku=26:nmod
29	on	on	ADP	IN	_	30	case	_	_
30	purpose	purpose	NOUN	NN	Number=Sing	23	obl	_	_
31	.	.	PUNCT	.	_	4	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 | **is a** | present | Turbulence | bumpy air |  |  |  | like waves in the sky | tree rules |
| 2 | **build** | present · passive |  | planes |  |  |  |  | tree rules |
| 3 | **handle** | to-infinitive |  |  |  |  |  |  | vn hold-15.1 «NP V NP»: agent=Agent |
| 4 | **bend** | present | the wings | a lot |  | flight |  | on purpose; upward *property* | vn assuming\_position-50 «NP V PP.location»: agent=Agent in flight=Location |

<!-- .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:technology:022-why-planes-fly.lesson:12`.

**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): R2-punct-next ×1, R5-strong ×1, R7-rel-agree ×2. **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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