---
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, which is why scientists study it so closely. Who acts: spider silk. A sentence of the lesson «Animal builders: spiders' webs and silk» of the biology course of Mova's primary school with its dependency tree and the pragmatics
---

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# Animal builders: spiders' webs and silk, sentence 4

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For its weight, some spider silk is stronger than steel and very stretchy, which is why scientists study it so closely.

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**Who acts:** spider silk · **What happens:** be

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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), 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:4
# text = For its weight, some spider silk is stronger than steel and very stretchy, which is why scientists study it so closely.
# 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): no change
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	which	which	PRON	WDT	PronType=Rel	20	nsubj	_	_
17	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	cop	_	_
18	why	why	ADV	WRB	PronType=Int	20	advmod	_	_
19	scientists	scientist	NOUN	NNS	Number=Plur	20	nsubj	_	_
20	study	study	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	9	advcl	_	_
21	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	20	obj	_	_
22	so	so	ADV	RB	_	23	advmod	_	_
23	closely	closely	ADV	RB	_	20	advmod	_	_
24	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

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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; strong *property* | tree rules |
| 2 | **be** |  | some spider silk *not said here* |  |  |  |  |  | tree rules |
| 3 | **is** | present |  |  |  |  |  | closely, study *property* | tree rules |

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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:biology:244-animal-builders-spiders-webs-and-silk.lesson:4`.

**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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