---
title: Steel wheels on smooth steel rails roll with very little friction, t… — Trains and the Underground · tree and pragmatics
description: Steel wheels on smooth steel rails roll with very little friction, the rubbing that slows things down. Who acts: Steel wheels, rubbing. A sentence of the lesson «Trains and the Underground» of the technology course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Trains and the Underground, sentence 2

<!-- .ven lang=en -->
Steel wheels on smooth steel rails roll with very little friction, the rubbing that slows things down.

<!-- .vintro -->
**Who acts:** Steel wheels, rubbing · **What happens:** roll, slow down · **To what, where:** things

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This is a sentence of the lesson «Trains and the Underground» of the technology 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 (Steel wheels, rubbing), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:technology:021-trains-and-the-underground.lesson:2
# text = Steel wheels on smooth steel rails roll with very little friction, the rubbing that slows things down.
# source = school lesson (ours)
# course = technology
# lesson = 021-trains-and-the-underground.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): R6-punct-agree ×1, R7-rel-agree ×1
1	Steel	steel	NOUN	NN	Number=Sing	2	compound	_	_
2	wheels	wheel	NOUN	NNS	Number=Plur	7	nsubj	_	_
3	on	on	ADP	IN	_	6	case	_	_
4	smooth	smooth	ADJ	JJ	Degree=Pos	6	amod	_	_
5	steel	steel	NOUN	NN	Number=Sing	6	compound	_	_
6	rails	rail	NOUN	NNS	Number=Plur	2	nmod	_	_
7	roll	roll	VERB	VBP	Mood=Ind|Tense=Pres|VerbForm=Fin	0	root	_	_
8	with	with	ADP	IN	_	11	case	_	_
9	very	very	ADV	RB	_	10	advmod	_	_
10	little	little	ADJ	JJ	Degree=Pos	11	amod	_	_
11	friction	friction	NOUN	NN	Number=Sing	7	obl	_	_
12	,	,	PUNCT	,	_	14	punct	_	_
13	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
14	rubbing	rubbing	NOUN	NN	Number=Sing	11	appos	_	_
15	that	that	PRON	WDT	PronType=Rel	16	nsubj	_	_
16	slows	slow	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	acl:relcl	_	_
17	things	thing	NOUN	NNS	Number=Plur	16	obj	_	_
18	down	down	ADP	RP	_	16	compound:prt	_	Agree=R7-rel-agree|Haiku=16:advmod|HaikuPos=ADV:RB:_
19	.	.	PUNCT	.	_	7	punct	_	Agree=R6-punct-agree|Haiku=2:punct
```

## Pragmatics {#pragmatics}

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

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **roll** | present | Steel wheels on smooth steel rails |  |  |  |  | with little friction | vn sound\_emission-43.2 «NP.location V PP.theme»: agent=Location with friction=Theme |
| 2 | **slow down** | present | the rubbing | things |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent thing=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:technology:021-trains-and-the-underground.lesson:2`.

**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): R6-punct-agree ×1, 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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- ← previous: [Trains and the Underground, 1](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/1/)
- next →: [Trains and the Underground, 3](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/3/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/)