---
title: An escalator is a loop of steps on a chain pulled by a motor; the st… — Escalators and lifts · tree and pragmatics
description: An escalator is a loop of steps on a chain pulled by a motor; the steps flatten at the top and bottom, and the handrail moves at the same speed as the steps. Who acts: escalator, steps, handrail. A sentence of the lesson «Escalators and lifts» of the technology course of Mova's primary school with i
---

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# Escalators and lifts, sentence 7

<!-- .ven lang=en -->
An escalator is a loop of steps on a chain pulled by a motor; the steps flatten at the top and bottom, and the handrail moves at the same speed as the steps.

<!-- .vintro -->
**Who acts:** escalator, steps, handrail · **What happens:** be, pull, flatten, move · **To what, where:** loop, chain, top, same speed

<!-- .vabout -->
This is a sentence of the lesson «Escalators and lifts» 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 (escalator, steps, handrail), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:technology:026-escalators-and-lifts.lesson:7
# text = An escalator is a loop of steps on a chain pulled by a motor; the steps flatten at the top and bottom, and the handrail moves at the same speed as the steps.
# source = school lesson (ours)
# course = technology
# lesson = 026-escalators-and-lifts.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	An	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	escalator	escalator	NOUN	NN	Number=Sing	5	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
5	loop	loop	NOUN	NN	Number=Sing	0	root	_	_
6	of	of	ADP	IN	_	7	case	_	_
7	steps	step	NOUN	NNS	Number=Plur	5	nmod	_	_
8	on	on	ADP	IN	_	10	case	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
10	chain	chain	NOUN	NN	Number=Sing	7	nmod	_	_
11	pulled	pull	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	10	acl	_	Agree=R5-strong|Haiku=7:acl
12	by	by	ADP	IN	_	14	case	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
14	motor	motor	NOUN	NN	Number=Sing	11	obl	_	_
15	;	;	PUNCT	:	_	18	punct	_	_
16	the	the	DET	DT	Definite=Def|PronType=Art	17	det	_	_
17	steps	step	NOUN	NNS	Number=Plur	18	nsubj	_	_
18	flatten	flatten	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	parataxis	_	_
19	at	at	ADP	IN	_	21	case	_	_
20	the	the	DET	DT	Definite=Def|PronType=Art	21	det	_	_
21	top	top	NOUN	NN	Number=Sing	18	obl	_	_
22	and	and	CCONJ	CC	_	23	cc	_	_
23	bottom	bottom	NOUN	NN	Number=Sing	21	conj	_	_
24	,	,	PUNCT	,	_	28	punct	_	_
25	and	and	CCONJ	CC	_	28	cc	_	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	_	_
27	handrail	handrail	NOUN	NN	Number=Sing	28	nsubj	_	_
28	moves	move	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	18	conj	_	_
29	at	at	ADP	IN	_	32	case	_	_
30	the	the	DET	DT	Definite=Def|PronType=Art	32	det	_	_
31	same	same	ADJ	JJ	Degree=Pos	32	amod	_	_
32	speed	speed	NOUN	NN	Number=Sing	28	obl	_	_
33	as	as	ADP	IN	_	35	case	_	_
34	the	the	DET	DT	Definite=Def|PronType=Art	35	det	_	_
35	steps	step	NOUN	NNS	Number=Plur	32	nmod	_	_
36	.	.	PUNCT	.	_	5	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 | **is a** | present | a escalator | a loop |  |  |  | of steps on a chain | tree rules |
| 2 | **pull** | participle |  | a chain *not said here* |  |  |  | by a motor | vn slide-11.2 «NP V»: agent=Theme |
| 3 | **flatten** | present | the steps |  |  | the top and bottom |  |  | vn carve-21.2-1 «NP V ADVP-Middle»: agent=Patient |
| 4 | **move** | present | the handrail |  |  | the same speed as the steps |  |  | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme at speed=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:026-escalators-and-lifts.lesson:7`.

**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/).

<!-- /div -->

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- ← previous: [Escalators and lifts, 6](https://md.mova.elamur.ai/free/en/corpora/school/technology/26-escalators-and-lifts/6/)
- next →: [Escalators and lifts, 8](https://md.mova.elamur.ai/free/en/corpora/school/technology/26-escalators-and-lifts/8/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/technology/26-escalators-and-lifts/)