---
title: Because steel wheels roll so easily on steel rails, a fast train can… — Trains and the Underground · tree and pragmatics
description: Because steel wheels roll so easily on steel rails, a fast train can need more than a kilometre to stop. Who acts: steel wheels, fast train. 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 cl
---

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# Trains and the Underground, sentence 9

<!-- .ven lang=en -->
Because steel wheels roll so easily on steel rails, a fast train can need more than a kilometre to stop.

<!-- .vintro -->
**Who acts:** steel wheels, fast train · **What happens:** roll, need, stop · **To what, where:** steel rails, more

<!-- .vabout -->
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, fast train), 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:9
# text = Because steel wheels roll so easily on steel rails, a fast train can need more than a kilometre to stop.
# 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): R5-strong ×1
1	Because	because	SCONJ	IN	_	4	mark	_	_
2	steel	steel	NOUN	NN	Number=Sing	3	compound	_	_
3	wheels	wheel	NOUN	NNS	Number=Plur	4	nsubj	_	_
4	roll	roll	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	15	advcl	_	_
5	so	so	ADV	RB	_	6	advmod	_	_
6	easily	easily	ADV	RB	_	4	advmod	_	_
7	on	on	ADP	IN	_	9	case	_	_
8	steel	steel	NOUN	NN	Number=Sing	9	compound	_	_
9	rails	rail	NOUN	NNS	Number=Plur	4	obl	_	_
10	,	,	PUNCT	,	_	4	punct	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
12	fast	fast	ADJ	JJ	Degree=Pos	13	amod	_	_
13	train	train	NOUN	NN	Number=Sing	15	nsubj	_	_
14	can	can	AUX	MD	VerbForm=Fin	15	aux	_	_
15	need	need	VERB	VB	VerbForm=Inf	0	root	_	_
16	more	more	ADJ	JJR	Degree=Cmp	15	obj	_	_
17	than	than	ADP	IN	_	19	case	_	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	19	det	_	_
19	kilometre	kilometre	NOUN	NN	Number=Sing	15	obj	_	Agree=R5-strong|Haiku=16:obl
20	to	to	PART	TO	_	21	mark	_	_
21	stop	stop	VERB	VB	VerbForm=Inf	19	acl	_	_
22	.	.	PUNCT	.	_	15	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 | **roll** | present | steel wheels |  |  | steel rails |  | easily *property* | vn run-51.3.2-2 «NP V PP.location»: agent=Theme on rail=Trajectory |
| 2 | **need** | can | a fast train | more |  |  |  |  | tree rules |
| 3 | **stop** | to-infinitive | a fast train *not said here* |  |  |  |  |  | vn stop-55.4-1-1 «NP.eventuality V»: agent=Eventuality |

<!-- .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:9`.

**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): R5-strong ×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, 8](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/8/)
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