---
title: A propeller's twisted blades push water backwards as they spin, so t… — Ships, ports and submarines · tree and pragmatics
description: A propeller's twisted blades push water backwards as they spin, so the ship moves forward; the biggest ship propellers are taller than a house. Who acts: twisted blades, blades, ship, biggest ship propellers. A sentence of the lesson «Ships, ports and submarines» of the technology course of Mova's p
---

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# Ships, ports and submarines, sentence 19

<!-- .ven lang=en -->
A propeller's twisted blades push water backwards as they spin, so the ship moves forward; the biggest ship propellers are taller than a house.

<!-- .vintro -->
**Who acts:** twisted blades, blades, ship, biggest ship propellers · **What happens:** push, spin, move forward, be · **To what, where:** water

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This is a sentence of the lesson «Ships, ports and submarines» 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 (twisted blades, blades, ship, biggest ship propellers), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:technology:024-ships-ports-and-submarines.lesson:19
# text = A propeller's twisted blades push water backwards as they spin, so the ship moves forward; the biggest ship propellers are taller than a house.
# source = school lesson (ours)
# course = technology
# lesson = 024-ships-ports-and-submarines.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	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	propeller	propeller	NOUN	NN	Number=Sing	5	nmod:poss	_	_
3	's	's	PART	POS	_	2	case	_	_
4	twisted	twisted	ADJ	JJ	Degree=Pos	5	amod	_	_
5	blades	blade	NOUN	NNS	Number=Plur	6	nsubj	_	_
6	push	push	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	water	water	NOUN	NN	Number=Sing	6	obj	_	_
8	backwards	backward	ADV	RB	_	6	advmod	_	_
9	as	as	SCONJ	IN	_	11	mark	_	_
10	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	11	nsubj	_	_
11	spin	spin	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	advcl	_	_
12	,	,	PUNCT	,	_	16	punct	_	_
13	so	so	ADV	RB	_	16	advmod	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	ship	ship	NOUN	NN	Number=Sing	16	nsubj	_	_
16	moves	move	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	conj	_	_
17	forward	forward	ADV	RB	_	16	advmod	_	_
18	;	;	PUNCT	:	_	24	punct	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	22	det	_	_
20	biggest	big	ADJ	JJS	Degree=Sup	22	amod	_	_
21	ship	ship	NOUN	NN	Number=Sing	22	compound	_	_
22	propellers	propeller	NOUN	NNS	Number=Plur	24	nsubj	_	_
23	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	24	cop	_	_
24	taller	tall	ADJ	JJR	Degree=Cmp	16	parataxis	_	_
25	than	than	ADP	IN	_	27	case	_	_
26	a	a	DET	DT	Definite=Ind|PronType=Art	27	det	_	_
27	house	house	NOUN	NN	Number=Sing	24	obl	_	_
28	.	.	PUNCT	.	_	6	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 | **push** | present | a propeller's twisted blades | water |  |  |  | backward *property* | vn carry-11.4-1-1 «NP V NP»: agent=Agent water=Theme |
| 2 | **spin** | present | blades *= blade* |  |  |  |  |  | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 3 | **move forward** | present | the ship |  |  |  |  | forward *property* | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 4 | **is** | present | the biggest ship propellers |  |  |  |  | than a house; tall *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:technology:024-ships-ports-and-submarines.lesson:19`.

**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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- ← previous: [Ships, ports and submarines, 18](https://md.mova.elamur.ai/free/en/corpora/school/technology/24-ships-ports-and-submarines/18/)
- next →: [Ships, ports and submarines, 20](https://md.mova.elamur.ai/free/en/corpora/school/technology/24-ships-ports-and-submarines/20/)
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