---
title: Most airliners have 2 engines, and some very big ones have 4. — Why planes fly · tree and pragmatics
description: Most airliners have 2 engines, and some very big ones have 4. Who acts: Most airliners, big ones. A sentence of the lesson «Why planes fly» of the technology course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Why planes fly, sentence 18

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Most airliners have 2 engines, and some very big ones have 4.

<!-- .vintro -->
**Who acts:** Most airliners, big ones · **What happens:** have · **To what, where:** 2 engines, 4

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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 (Most airliners, big ones), 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:18
# text = Most airliners have 2 engines, and some very big ones have 4.
# 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
1	Most	most	ADJ	JJS	Degree=Sup	2	amod	_	_
2	airliners	airliner	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	2	2	NUM	CD	NumForm=Digit|NumType=Card	5	nummod	_	_
5	engines	engine	NOUN	NNS	Number=Plur	3	obj	_	_
6	,	,	PUNCT	,	_	12	punct	_	Agree=R2-punct-next|Haiku=3:punct
7	and	and	CCONJ	CC	_	12	cc	_	_
8	some	some	DET	DT	PronType=Ind	11	det	_	_
9	very	very	ADV	RB	_	10	advmod	_	_
10	big	big	ADJ	JJ	Degree=Pos	11	amod	_	_
11	ones	one	NOUN	NNS	Number=Plur	12	nsubj	_	_
12	have	have	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
13	4	4	NUM	CD	NumForm=Digit|NumType=Card	12	obj	_	_
14	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

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- 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 | **have** | present | Most airliners | 2 engines |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent engine=Patient |
| 2 | **have** | present | some big ones | 4 |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent 4=Patient |

<!-- .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:18`.

**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. **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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