---
title: Identify the principal reason for which the conductor rail, hereinaf… — Trains, the Underground and subways · tree and pragmatics
description: Identify the principal reason for which the conductor rail, hereinafter the third rail, must at all times be avoided. Exam question 2 of lesson 270 «Trains, the Underground and subways» of the everyday course of Mova's primary school, with the dependency tree and pragmatics of the question and of ea
---

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# Exam question 2 · Trains, the Underground and subways

<!-- .ven lang=en -->
Identify the principal reason for which the conductor rail, hereinafter the third rail, must at all times be avoided.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you · **What happens:** identify, avoid · **To what, where:** principal reason, conductor rail

<!-- .vabout -->
This is exam question 2 of lesson 270 «Trains, the Underground and subways» of the everyday course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/everyday/270-trains-and-subways/#e2).

## The question {#question}

```conllu
# sent_id = question:everyday:270-trains-and-subways:e2:1
# text = Identify the principal reason for which the conductor rail, hereinafter the third rail, must at all times be avoided.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	21	obl	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	conductor	conductor	NOUN	NN	Number=Sing	9	compound	_	_
9	rail	rail	NOUN	NN	Number=Sing	21	nsubj:pass	_	SpaceAfter=No
10	,	,	PUNCT	,	_	11	punct	_	_
11	hereinafter	hereinafter	NOUN	NN	Number=Sing	9	conj	_	_
12	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
13	third	third	ADJ	JJ	Degree=Pos|NumForm=Word|NumType=Ord	14	amod	_	_
14	rail	rail	NOUN	NN	Number=Sing	21	nsubj:pass	_	SpaceAfter=No
15	,	,	PUNCT	,	_	14	punct	_	_
16	must	must	AUX	MD	VerbForm=Fin	21	aux	_	_
17	at	at	ADP	IN	_	19	case	_	_
18	all	all	DET	DT	PronType=Tot	19	det	_	_
19	times	time	NOUN	NNS	Number=Plur	21	obl	_	_
20	be	be	AUX	VB	VerbForm=Inf	21	aux:pass	_	_
21	avoided	avoid	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl:relcl	_	SpaceAfter=No
22	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal reason |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent reason=Theme |
| 2 | **avoid** | must · passive |  | the conductor rail and hereinafter |  |  | time | for the principal reason | vn avoid-52 «NP V NP.location»: subject=Location |

<!-- .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.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
It is heated to a dangerous temperature in winter months

```conllu
# sent_id = question:everyday:270-trains-and-subways:e2:o1:1
# text = It is heated to a dangerous temperature in winter months
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	heated	heat	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	to	to	ADP	IN	_	7	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	dangerous	dangerous	ADJ	JJ	Degree=Pos	7	amod	_	_
7	temperature	temperature	NOUN	NN	Number=Sing	3	obl	_	_
8	in	in	ADP	IN	_	10	case	_	_
9	winter	winter	NOUN	NN	Number=Sing	10	compound	_	_
10	months	month	NOUN	NNS	Number=Plur	7	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **heat** | present · passive |  | It |  |  |  | to a dangerous temperature in winter months *result* | vn cooking-45.3 «NP V NP PP.result»: subject=Patient to temperature=Result |

### Option 2 {#o2}

<!-- .ven lang=en -->
It is liable to collapse under a person's weight

```conllu
# sent_id = question:everyday:270-trains-and-subways:e2:o2:1
# text = It is liable to collapse under a person's weight
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	liable	liable	ADJ	JJ	Degree=Pos	0	root	_	_
4	to	to	PART	TO	_	5	mark	_	_
5	collapse	collapse	VERB	VB	VerbForm=Inf	3	xcomp	_	_
6	under	under	ADP	IN	_	10	case	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	person	person	NOUN	NN	Number=Sing	10	nmod:poss	_	SpaceAfter=No
9	's	's	PART	POS	_	8	case	_	_
10	weight	weight	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  |  |  | liable *property* | tree rules |
| 2 | **collapse** | to-infinitive |  |  |  | a person's weight |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
It carries electricity sufficient to cause death

```conllu
# sent_id = question:everyday:270-trains-and-subways:e2:o3:1
# text = It carries electricity sufficient to cause death
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	carries	carry	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	electricity	electricity	NOUN	NN	Number=Sing	2	obj	_	_
4	sufficient	sufficient	ADJ	JJ	Degree=Pos	2	xcomp	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	cause	cause	VERB	VB	VerbForm=Inf	4	advcl	_	_
7	death	death	NOUN	NN	Number=Sing	6	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **carry** | present | It | electricity |  |  |  | sufficient *property* | vn carry-11.4 «NP V NP»: agent=Agent electricity=Theme |
| 2 | **cause** | to-infinitive |  | death |  |  |  |  | vn engender-27.1-1 «NP V NP»: agent=Precondition death=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
It is energised solely during peak hours

```conllu
# sent_id = question:everyday:270-trains-and-subways:e2:o4:1
# text = It is energised solely during peak hours
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	energised	energise	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	solely	solely	ADV	RB	_	3	advmod	_	_
5	during	during	ADP	IN	_	7	case	_	_
6	peak	peak	NOUN	NN	Number=Sing	7	compound	_	_
7	hours	hour	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **energise** | present · passive |  | It |  |  | hour | solely *property* | tree rules |

<!-- div src -->

**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

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- ← previous: [Trains, the Underground and subways, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/everyday/270-trains-and-subways/e1/)
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