---
title: Knots in laces hold only because the lace rubs on itself. — Living with friction: oil, wheels and grip · tree and pragmatics
description: Knots in laces hold only because the lace rubs on itself. Who acts: Knots, lace. A sentence of the lesson «Living with friction: oil, wheels and grip» of the physics course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Living with friction: oil, wheels and grip, sentence 17

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Knots in laces hold only because the lace rubs on itself.

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**Who acts:** Knots, lace · **What happens:** hold, rub

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This is a sentence of the lesson «Living with friction: oil, wheels and grip» of the physics 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 (Knots, lace), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:007-living-with-friction.lesson:17
# text = Knots in laces hold only because the lace rubs on itself.
# source = school lesson (ours)
# course = physics
# lesson = 007-living-with-friction.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	Knots	knot	NOUN	NNS	Number=Plur	4	nsubj	_	_
2	in	in	ADP	IN	_	3	case	_	_
3	laces	lace	NOUN	NNS	Number=Plur	1	nmod	_	_
4	hold	hold	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	only	only	ADV	RB	_	4	advmod	_	_
6	because	because	SCONJ	IN	ExtPos=ADP	9	mark	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	lace	lace	NOUN	NN	Number=Sing	9	nsubj	_	_
9	rubs	rub	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	advcl	_	_
10	on	on	ADP	IN	_	11	case	_	_
11	itself	itself	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs|Reflex=Yes	9	obl	_	_
12	.	.	PUNCT	.	_	4	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 | **hold** | present | Knots in laces |  |  |  |  |  | vn exist-47.1 «NP V»: agent=Theme |
| 2 | **rub** | present | the lace |  |  |  |  | on slope | vn spray-9.7-1 «NP V PP.destination»: agent=Theme on itself=Destination |

<!-- .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:physics:007-living-with-friction.lesson:17`.

**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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- ← previous: [Living with friction: oil, wheels and…, 16](https://md.mova.elamur.ai/free/en/corpora/school/physics/7-living-with-friction/16/)
- next →: [Living with friction: oil, wheels and…, 18](https://md.mova.elamur.ai/free/en/corpora/school/physics/7-living-with-friction/18/)
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