---
title: The surface of water acts like a thin stretchy skin, because water m… — Floating in the real world: ice, submarines and… · tree and pragmatics
description: The surface of water acts like a thin stretchy skin, because water molecules hold tightly together at the top. Who acts: surface, water molecules. A sentence of the lesson «Floating in the real world: ice, submarines and balloons» of the physics course of Mova's primary school with its dependency tr
---

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# Floating in the real world: ice, submarines and balloons, sentence 13

<!-- .ven lang=en -->
The surface of water acts like a thin stretchy skin, because water molecules hold tightly together at the top.

<!-- .vintro -->
**Who acts:** surface, water molecules · **What happens:** act, hold · **To what, where:** top

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This is a sentence of the lesson «Floating in the real world: ice, submarines and balloons» of the physics 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 (surface, water molecules), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:012-ice-submarines-and-balloons.lesson:13
# text = The surface of water acts like a thin stretchy skin, because water molecules hold tightly together at the top.
# source = school lesson (ours)
# course = physics
# lesson = 012-ice-submarines-and-balloons.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	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	surface	surface	NOUN	NN	Number=Sing	5	nsubj	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	water	water	NOUN	NN	Number=Sing	2	nmod	_	_
5	acts	act	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	like	like	ADP	IN	_	10	case	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
8	thin	thin	ADJ	JJ	Degree=Pos	10	amod	_	_
9	stretchy	stretchy	ADJ	JJ	Degree=Pos	10	amod	_	_
10	skin	skin	NOUN	NN	Number=Sing	5	obl	_	_
11	,	,	PUNCT	,	_	15	punct	_	_
12	because	because	SCONJ	IN	_	15	mark	_	_
13	water	water	NOUN	NN	Number=Sing	14	compound	_	_
14	molecules	molecule	NOUN	NNS	Number=Plur	15	nsubj	_	_
15	hold	hold	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	advcl	_	_
16	tightly	tightly	ADV	RB	_	15	advmod	_	_
17	together	together	ADV	RB	_	15	advmod	_	_
18	at	at	ADP	IN	_	20	case	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	20	det	_	_
20	top	top	NOUN	NN	Number=Sing	15	obl	_	_
21	.	.	PUNCT	.	_	5	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- 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 | **act** | present | the surface of water |  |  |  |  | like a thin stretchy skin | vn masquerade-29.6-1 «NP V PP.attribute»: agent=Agent like skin=Attribute |
| 2 | **hold** | present | water molecules |  |  | the top |  | tightly, together *property* | vn exist-47.1 «NP V PP.location»: agent=Theme at top=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:physics:012-ice-submarines-and-balloons.lesson:13`.

**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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