---
title: The edge of a black hole is called the event horizon: anything that… — Black holes · tree and pragmatics
description: The edge of a black hole is called the event horizon: anything that crosses it can never come back out. Who acts: anything. A sentence of the lesson «Black holes» of the space course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Black holes, sentence 6

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The edge of a black hole is called the event horizon: anything that crosses it can never come back out.

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**Who acts:** anything · **What happens:** call, cross, not come back · **To what, where:** edge, hole · **Speech:** someone speaks here

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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 (anything), 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:6
# text = The edge of a black hole is called the event horizon: anything that crosses it can never come back out.
# 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	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	edge	edge	NOUN	NN	Number=Sing	8	nsubj:pass	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
5	black	black	ADJ	JJ	Degree=Pos	6	amod	_	_
6	hole	hole	NOUN	NN	Number=Sing	2	nmod	_	_
7	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	aux:pass	_	_
8	called	call	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
10	event	event	NOUN	NN	Number=Sing	11	compound	_	_
11	horizon	horizon	NOUN	NN	Number=Sing	8	xcomp	_	_
12	:	:	PUNCT	:	_	8	punct	_	_
13	anything	anything	PRON	NN	Number=Sing|PronType=Ind	19	nsubj	_	_
14	that	that	PRON	WDT	PronType=Rel	15	nsubj	_	_
15	crosses	cross	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	13	acl:relcl	_	_
16	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	15	obj	_	_
17	can	can	AUX	MD	VerbForm=Fin	19	aux	_	_
18	never	never	ADV	RB	PronType=Neg	19	advmod	_	_
19	come	come	VERB	VB	VerbForm=Inf	8	parataxis	_	_
20	back	back	ADV	RB	_	19	advmod	_	_
21	out	out	ADV	RB	_	19	advmod	_	_
22	.	.	PUNCT	.	_	8	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **call** *speech: assert* | present · passive |  | the edge of a black hole |  |  |  |  | vn initiate\_communication-37.4.2-1 «NP V NP.recipient»: subject=Recipient |
| 2 | **cross** | present |  | hole |  |  |  |  | vn crane-40.3.2 «NP V NP»: agent=Agent it=Patient |
| 3 | **not** **come back** | can | anything |  |  |  |  | out *property* | vn escape-51.1-1 «NP V»: agent=Theme |

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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:6`.

**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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