---
title: A signal shows red when a train is in the section ahead; modern sign… — Trains and the Underground · tree and pragmatics
description: A signal shows red when a train is in the section ahead; modern signalling can stop a train automatically if it passes a red signal. Who acts: signal, train, modern signalling. A sentence of the lesson «Trains and the Underground» of the technology course of Mova's primary school with its dependency
---

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# Trains and the Underground, sentence 13

<!-- .ven lang=en -->
A signal shows red when a train is in the section ahead; modern signalling can stop a train automatically if it passes a red signal.

<!-- .vintro -->
**Who acts:** signal, train, modern signalling · **What happens:** show, be, stop, pass · **To what, where:** section, train, red signal

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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 (signal, train, modern signalling), 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:13
# text = A signal shows red when a train is in the section ahead; modern signalling can stop a train automatically if it passes a red signal.
# 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): no change
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	signal	signal	NOUN	NN	Number=Sing	3	nsubj	_	_
3	shows	show	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	red	red	ADV	RB	_	3	advmod	_	_
5	when	when	ADV	WRB	PronType=Int	11	advmod	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	train	train	NOUN	NN	Number=Sing	11	nsubj	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	cop	_	_
9	in	in	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	section	section	NOUN	NN	Number=Sing	3	advcl	_	_
12	ahead	ahead	ADV	RB	_	11	advmod	_	_
13	;	;	PUNCT	,	_	17	punct	_	_
14	modern	modern	ADJ	JJ	Degree=Pos	15	amod	_	_
15	signalling	signalling	NOUN	NN	Number=Sing	17	nsubj	_	_
16	can	can	AUX	MD	VerbForm=Fin	17	aux	_	_
17	stop	stop	VERB	VB	VerbForm=Inf	3	parataxis	_	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	19	det	_	_
19	train	train	NOUN	NN	Number=Sing	17	obj	_	_
20	automatically	automatically	ADV	RB	_	17	advmod	_	_
21	if	if	SCONJ	IN	_	23	mark	_	_
22	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	23	nsubj	_	_
23	passes	pass	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	17	advcl	_	_
24	a	a	DET	DT	Definite=Ind|PronType=Art	26	det	_	_
25	red	red	ADJ	JJ	Degree=Pos	26	amod	_	_
26	signal	signal	NOUN	NN	Number=Sing	23	obj	_	_
27	.	.	PUNCT	.	_	3	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 | **show** | present | a signal |  |  |  |  | red *property* | vn transfer\_mesg-37.1.1-1-1 «NP V»: agent=Agent |
| 2 | **is** | present | a train |  |  | the section |  | ahead *property* | tree rules |
| 3 | **stop** | can | modern signalling | a train |  |  |  | automatically *property* | vn stop-55.4-1-1 «NP V NP.eventuality»: agent=Subeventuality train=Eventuality |
| 4 | **pass** *a condition, not said to happen* | present | train | a red signal |  |  |  |  | vn escape-51.1-1-3 «NP V NP»: agent=Theme signal=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:technology:021-trains-and-the-underground.lesson:13`.

**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: [Trains and the Underground, 12](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/12/)
- next →: [Trains and the Underground, 14](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/14/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/technology/21-trains-and-the-underground/)