---
title: The brain has about 86 billion nerve cells; it is only about 2 perce… — The brain and nerves · tree and pragmatics
description: The brain has about 86 billion nerve cells; it is only about 2 percent of the body's weight but uses about a fifth of its energy. Who acts: brain. A sentence of the lesson «The brain and nerves» of the biology course of Mova's primary school with its dependency tree and the pragmatics of every claus
---

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# The brain and nerves, sentence 6

<!-- .ven lang=en -->
The brain has about 86 billion nerve cells; it is only about 2 percent of the body's weight but uses about a fifth of its energy.

<!-- .vintro -->
**Who acts:** brain · **What happens:** have, be, use · **To what, where:** billion nerve cells, 2 percent, fifth

<!-- .vabout -->
This is a sentence of the lesson «The brain and nerves» of the biology 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 (brain), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:068-the-brain-and-nerves.lesson:6
# text = The brain has about 86 billion nerve cells; it is only about 2 percent of the body's weight but uses about a fifth of its energy.
# source = school lesson (ours)
# course = biology
# lesson = 068-the-brain-and-nerves.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, R5-strong ×1, R7-rel-agree ×2
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	brain	brain	NOUN	NN	Number=Sing	3	nsubj	_	_
3	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	about	about	ADV	RB	_	6	advmod	_	_
5	86	86	NUM	CD	NumForm=Digit|NumType=Card	6	compound	_	_
6	billion	billion	NUM	CD	NumForm=Word|NumType=Card	8	nummod	_	_
7	nerve	nerve	NOUN	NN	Number=Sing	8	compound	_	_
8	cells	cell	NOUN	NNS	Number=Plur	3	obj	_	_
9	;	;	PUNCT	,	_	15	punct	_	Agree=R2-punct-next|Haiku=3:punct
10	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	15	nsubj	_	_
11	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	cop	_	_
12	only	only	ADV	RB	_	14	advmod	_	Agree=R5-strong|Haiku=13:advmod
13	about	about	ADV	RB	_	14	advmod	_	_
14	2	2	NUM	CD	NumForm=Digit|NumType=Card	15	nummod	_	_
15	percent	percent	NOUN	NN	Number=Sing	3	parataxis	_	Agree=R7-rel-agree|Haiku=3:conj
16	of	of	ADP	IN	_	20	case	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	body	body	NOUN	NN	Number=Sing	20	nmod:poss	_	_
19	's	's	PART	POS	_	18	case	_	_
20	weight	weight	NOUN	NN	Number=Sing	15	nmod	_	_
21	but	but	CCONJ	CC	_	22	cc	_	_
22	uses	use	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	15	conj	_	_
23	about	about	ADP	IN	_	25	case	_	_
24	a	a	DET	DT	Definite=Ind|PronType=Art	25	det	_	_
25	fifth	fifth	NOUN	NN	Number=Sing	22	obj	_	Agree=R7-rel-agree|Haiku=22:obl
26	of	of	ADP	IN	_	28	case	_	_
27	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	28	nmod:poss	_	_
28	energy	energy	NOUN	NN	Number=Sing	25	nmod	_	_
29	.	.	PUNCT	.	_	3	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 | **have** | present | the brain | billion nerve cells |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent cell=Patient |
| 2 | **is a** | present | brain | 2 percent |  |  |  | of the body's weight | tree rules |
| 3 | **use** | present | brain *not said here* | a fifth of brain's energy |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent fifth=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:biology:068-the-brain-and-nerves.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): R2-punct-next ×1, R5-strong ×1, R7-rel-agree ×2. **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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