---
title: A black hole is a place where so much mass is squeezed into a small… — Black holes · tree and pragmatics
description: A black hole is a place where so much mass is squeezed into a small space that its gravity lets nothing, not even light, escape. Who acts: black hole, gravity, nothing. A sentence of the lesson «Black holes» of the space course of Mova's primary school with its dependency tree and the pragmatics of 
---

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# Black holes, sentence 5

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A black hole is a place where so much mass is squeezed into a small space that its gravity lets nothing, not even light, escape.

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**Who acts:** black hole, gravity, nothing · **What happens:** be, squeeze, let, escape · **To what, where:** place, much mass, small space

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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 (black hole, gravity, nothing), 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:5
# text = A black hole is a place where so much mass is squeezed into a small space that its gravity lets nothing, not even light, escape.
# 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): R2-punct-next ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	black	black	ADJ	JJ	Degree=Pos	3	amod	_	_
3	hole	hole	NOUN	NN	Number=Sing	6	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	place	place	NOUN	NN	Number=Sing	0	root	_	_
7	where	where	ADV	WRB	PronType=Rel	12	advmod	_	_
8	so	so	ADV	RB	_	9	advmod	_	_
9	much	much	ADJ	JJ	Degree=Pos	10	amod	_	_
10	mass	mass	NOUN	NN	Number=Sing	12	nsubj:pass	_	_
11	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	aux:pass	_	_
12	squeezed	squeeze	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	6	acl:relcl	_	_
13	into	into	ADP	IN	_	16	case	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	_	_
15	small	small	ADJ	JJ	Degree=Pos	16	amod	_	_
16	space	space	NOUN	NN	Number=Sing	12	obl	_	_
17	that	that	PRON	WDT	PronType=Rel	16	dep	_	_
18	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	19	nmod:poss	_	_
19	gravity	gravity	NOUN	NN	Number=Sing	20	nsubj	_	_
20	lets	let	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	16	acl:relcl	_	_
21	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	27	nsubj	_	_
22	,	,	PUNCT	,	_	25	punct	_	Agree=R2-punct-next|Haiku=21:punct
23	not	not	PART	RB	Polarity=Neg	25	advmod	_	_
24	even	even	ADV	RB	_	25	advmod	_	_
25	light	light	NOUN	NN	Number=Sing	21	conj	_	_
26	,	,	PUNCT	,	_	27	punct	_	_
27	escape	escape	VERB	VB	VerbForm=Inf	20	xcomp	_	_
28	.	.	PUNCT	.	_	6	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 | **is a** | present | a black hole | a place |  |  |  |  | tree rules |
| 2 | **squeeze** | present · passive |  | much mass |  | a small space |  |  | vn knead-26.5 «NP V NP.material PP.product»: subject=Material into space=Product |
| 3 | **let** | present | hole's gravity | a small space *not said here* |  |  |  |  | tree rules |
| 4 | **escape** | infinitive | nothing |  |  |  |  |  | vn escape-51.1-1-1 «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:5`.

**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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