---
title: Its edge is the event horizon, a point of no return: like a waterfal… — Black holes · tree and pragmatics
description: Its edge is the event horizon, a point of no return: like a waterfall, you can paddle safely far upstream, but once you go over the edge you can never come back. Who acts: edge, you. A sentence of the lesson «Black holes» of the space course of Mova's primary school with its dependency tree and the 
---

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# Black holes, sentence 1

<!-- .ven lang=en -->
Its edge is the event horizon, a point of no return: like a waterfall, you can paddle safely far upstream, but once you go over the edge you can never come back.

<!-- .vintro -->
**Who acts:** edge, you · **What happens:** be, paddle, go, not come back, point · **To what, where:** event horizon, edge, return

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This is a sentence of the lesson «Black holes» of the space 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 (edge, you), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:025-black-holes.lesson:1
# text = Its edge is the event horizon, a point of no return: like a waterfall, you can paddle safely far upstream, but once you go over the edge you can never come back.
# source = school lesson (ours)
# course = space
# lesson = 025-black-holes.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	Its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	edge	edge	NOUN	NN	Number=Sing	6	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	event	event	NOUN	NN	Number=Sing	6	compound	_	_
6	horizon	horizon	NOUN	NN	Number=Sing	0	root	_	_
7	,	,	PUNCT	,	_	9	punct	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
9	point	point	NOUN	NN	Number=Sing	6	appos	_	_
10	of	of	ADP	IN	_	12	case	_	_
11	no	no	DET	DT	PronType=Neg	12	det	_	_
12	return	return	NOUN	NN	Number=Sing	9	nmod	_	_
13	:	:	PUNCT	:	_	20	punct	_	_
14	like	like	ADP	IN	_	16	case	_	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	_	_
16	waterfall	waterfall	NOUN	NN	Number=Sing	20	obl	_	_
17	,	,	PUNCT	,	_	16	punct	_	_
18	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	20	nsubj	_	_
19	can	can	AUX	MD	VerbForm=Fin	20	aux	_	_
20	paddle	paddle	VERB	VB	VerbForm=Inf	6	parataxis	_	_
21	safely	safely	ADV	RB	_	20	advmod	_	_
22	far	far	ADV	RB	Degree=Pos	23	advmod	_	_
23	upstream	upstream	ADV	RB	_	20	advmod	_	_
24	,	,	PUNCT	,	_	35	punct	_	_
25	but	but	CCONJ	CC	_	35	cc	_	_
26	once	once	SCONJ	IN	_	28	mark	_	_
27	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	28	nsubj	_	_
28	go	go	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	35	advcl	_	_
29	over	over	ADP	IN	_	31	case	_	_
30	the	the	DET	DT	Definite=Def|PronType=Art	31	det	_	_
31	edge	edge	NOUN	NN	Number=Sing	28	obl	_	_
32	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	35	nsubj	_	_
33	can	can	AUX	MD	VerbForm=Fin	35	aux	_	_
34	never	never	ADV	RB	PronType=Neg	35	advmod	_	_
35	come	come	VERB	VB	VerbForm=Inf	20	conj	_	_
36	back	back	ADV	RB	_	35	advmod	_	_
37	.	.	PUNCT	.	_	6	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: changed act=assert

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | hole's edge | the event horizon |  |  |  |  | tree rules |
| 2 | **paddle** | can | you |  |  |  |  | like a waterfall; safely, upstream *property* | vn nonvehicle-51.4.2 «NP.agent V»: agent=Agent |
| 3 | **go** | present | you |  |  | the edge |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme over edge=Initial\_Location |
| 4 | **not** **come back** | can | you |  |  |  |  |  | vn escape-51.1-1 «NP V»: agent=Theme |
| 5 | **point** |  |  | no return |  |  |  |  | nom point «cognition transitive»: of=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:space:025-black-holes.lesson:1`.

**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: [Black holes, 0](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/0/)
- next →: [Black holes, 2](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/2/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/)