---
title: For its weight, some spider silk is stronger than steel and very str… — Animal builders: spiders' webs and silk · tree and pragmatics
description: For its weight, some spider silk is stronger than steel and very stretchy, because its proteins are lined up in a special way; Darwin's bark spider in Madagascar spins webs across rivers up to about 25 metres wide. Who acts: spider silk, bark spider. A sentence of the lesson «Animal builders: spider
---

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# Animal builders: spiders' webs and silk, sentence 8

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For its weight, some spider silk is stronger than steel and very stretchy, because its proteins are lined up in a special way; Darwin's bark spider in Madagascar spins webs across rivers up to about 25 metres wide.

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**Who acts:** spider silk, bark spider · **What happens:** be, line up, spin · **To what, where:** proteins, webs, rivers

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This is a sentence of the lesson «Animal builders: spiders' webs and silk» 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 (spider silk, bark spider), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:244-animal-builders-spiders-webs-and-silk.lesson:8
# text = For its weight, some spider silk is stronger than steel and very stretchy, because its proteins are lined up in a special way; Darwin's bark spider in Madagascar spins webs across rivers up to about 25 metres wide.
# source = school lesson (ours)
# course = biology
# lesson = 244-animal-builders-spiders-webs-and-silk.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): R7-rel-agree ×1
1	For	for	ADP	IN	_	3	case	_	_
2	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
3	weight	weight	NOUN	NN	Number=Sing	9	obl	_	_
4	,	,	PUNCT	,	_	3	punct	_	_
5	some	some	DET	DT	PronType=Ind	7	det	_	_
6	spider	spider	NOUN	NN	Number=Sing	7	compound	_	_
7	silk	silk	NOUN	NN	Number=Sing	9	nsubj	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	cop	_	_
9	stronger	strong	ADJ	JJR	Degree=Cmp	0	root	_	_
10	than	than	ADP	IN	_	11	case	_	_
11	steel	steel	NOUN	NN	Number=Sing	9	obl	_	_
12	and	and	CCONJ	CC	_	14	cc	_	_
13	very	very	ADV	RB	_	14	advmod	_	_
14	stretchy	stretchy	ADJ	JJ	Degree=Pos	9	conj	_	_
15	,	,	PUNCT	,	_	20	punct	_	_
16	because	because	SCONJ	IN	_	20	mark	_	_
17	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	18	nmod:poss	_	_
18	proteins	protein	NOUN	NNS	Number=Plur	20	nsubj:pass	_	_
19	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	20	aux:pass	_	_
20	lined	line	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	9	advcl	_	_
21	up	up	ADP	RP	_	20	compound:prt	_	_
22	in	in	ADP	IN	_	25	case	_	_
23	a	a	DET	DT	Definite=Ind|PronType=Art	25	det	_	_
24	special	special	ADJ	JJ	Degree=Pos	25	amod	_	_
25	way	way	NOUN	NN	Number=Sing	20	obl	_	_
26	;	;	PUNCT	,	_	34	punct	_	_
27	Darwin	Darwin	PROPN	NNP	Number=Sing	30	nmod:poss	_	_
28	's	's	PART	POS	_	27	case	_	_
29	bark	bark	NOUN	NN	Number=Sing	30	compound	_	_
30	spider	spider	NOUN	NN	Number=Sing	33	nsubj	_	Agree=R7-rel-agree|Haiku=33:compound
31	in	in	ADP	IN	_	32	case	_	_
32	Madagascar	Madagascar	PROPN	NNP	Number=Sing	30	nmod	_	_
33	spins	spin	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	parataxis	_	_
34	webs	web	NOUN	NNS	Number=Plur	33	obj	_	_
35	across	across	ADP	IN	_	36	case	_	_
36	rivers	river	NOUN	NNS	Number=Plur	33	obl	_	_
37	up	up	ADP	IN	_	41	case	_	_
38	to	to	ADP	IN	_	37	fixed	_	_
39	about	about	ADV	RB	_	40	advmod	_	_
40	25	25	NUM	CD	NumForm=Digit|NumType=Card	41	nummod	_	_
41	metres	metre	NOUN	NNS	Number=Plur	9	obl	_	_
42	wide	wide	ADV	RB	_	9	advmod	_	_
43	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | some spider silk |  |  |  |  | for spider's weight; than steel; up 25 metres; strong, wide *property* | tree rules |
| 2 | **be** |  | some spider silk *not said here* |  |  |  |  |  | tree rules |
| 3 | **line up** | present · passive |  | spider's proteins |  |  |  | in a special way | vn fill-9.8-1 «NP V NP PP.theme»: subject=Destination in way=Theme |
| 4 | **spin** | present | Darwin's bark spider in Madagascar | webs |  | rivers |  |  | vn roll-51.3.1 «NP V NP PP.trajectory»: agent=Agent web=Theme across river=Trajectory |

<!-- .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:244-animal-builders-spiders-webs-and-silk.lesson:8`.

**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): R7-rel-agree ×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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