---
title: Lift doors use sensors, often a curtain of invisible light beams, or… — Escalators and lifts · tree and pragmatics
description: Lift doors use sensors, often a curtain of invisible light beams, or a rubber edge, to open again if something is in the way; never stop the doors with hands or feet, wait for the next lift. Who acts: Lift doors, something. A sentence of the lesson «Escalators and lifts» of the technology course of 
---

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# Escalators and lifts, sentence 13

<!-- .ven lang=en -->
Lift doors use sensors, often a curtain of invisible light beams, or a rubber edge, to open again if something is in the way; never stop the doors with hands or feet, wait for the next lift.

<!-- .vintro -->
**Who acts:** Lift doors, something · **What happens:** use, open, be, not stop, wait · **To what, where:** sensors, way, doors

<!-- .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 (Lift doors, something), 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:13
# text = Lift doors use sensors, often a curtain of invisible light beams, or a rubber edge, to open again if something is in the way; never stop the doors with hands or feet, wait for the next lift.
# 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 ×2
1	Lift	lift	NOUN	NN	Number=Sing	2	compound	_	_
2	doors	door	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	use	use	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	sensors	sensor	NOUN	NNS	Number=Plur	3	obj	_	_
5	,	,	PUNCT	,	_	8	punct	_	_
6	often	often	ADV	RB	_	8	advmod	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	curtain	curtain	NOUN	NN	Number=Sing	4	appos	_	Agree=R5-strong|Haiku=3:obl
9	of	of	ADP	IN	_	12	case	_	_
10	invisible	invisible	ADJ	JJ	Degree=Pos	12	amod	_	_
11	light	light	NOUN	NN	Number=Sing	12	compound	_	_
12	beams	beam	NOUN	NNS	Number=Plur	8	nmod	_	_
13	,	,	PUNCT	,	_	17	punct	_	_
14	or	or	CCONJ	CC	_	17	cc	_	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	_	_
16	rubber	rubber	NOUN	NN	Number=Sing	17	compound	_	_
17	edge	edge	NOUN	NN	Number=Sing	8	conj	_	_
18	,	,	PUNCT	,	_	20	punct	_	_
19	to	to	PART	TO	_	20	mark	_	_
20	open	open	VERB	VB	VerbForm=Inf	3	advcl	_	Agree=R5-strong|Haiku=17:acl
21	again	again	ADV	RB	_	20	advmod	_	_
22	if	if	SCONJ	IN	_	27	mark	_	_
23	something	something	PRON	NN	Number=Sing|PronType=Ind	27	nsubj	_	_
24	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	27	cop	_	_
25	in	in	ADP	IN	_	27	case	_	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	_	_
27	way	way	NOUN	NN	Number=Sing	20	advcl	_	_
28	;	;	PUNCT	,	_	30	punct	_	_
29	never	never	ADV	RB	PronType=Neg	30	advmod	_	_
30	stop	stop	VERB	VB	Mood=Imp|VerbForm=Fin	20	conj	_	_
31	the	the	DET	DT	Definite=Def|PronType=Art	32	det	_	_
32	doors	door	NOUN	NNS	Number=Plur	30	obj	_	_
33	with	with	ADP	IN	_	34	case	_	_
34	hands	hand	NOUN	NNS	Number=Plur	30	obl	_	_
35	or	or	CCONJ	CC	_	36	cc	_	_
36	feet	foot	NOUN	NNS	Number=Plur	34	conj	_	_
37	,	,	PUNCT	,	_	38	punct	_	_
38	wait	wait	VERB	VB	Mood=Imp|VerbForm=Fin	20	conj	_	_
39	for	for	ADP	IN	_	42	case	_	_
40	the	the	DET	DT	Definite=Def|PronType=Art	42	det	_	_
41	next	next	ADJ	JJ	Degree=Pos	42	amod	_	_
42	lift	lift	NOUN	NN	Number=Sing	38	obl	_	_
43	.	.	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 | **use** | present | Lift doors | sensors |  |  |  |  | vn eat-39.1 «NP V NP»: agent=Agent sensor=Patient |
| 2 | **open** | to-infinitive | Lift doors *not said here* |  |  |  | again |  | vn spatial\_configuration-47.6-1 «NP V»: agent=Theme |
| 3 | **is** *a condition, not said to happen* | present | something |  |  | the way |  |  | tree rules |
| 4 | **not** **stop** | infinitive | Lift doors *not said here* | the doors |  |  |  | with hands or feet | vn stop-55.4-1-1 «NP V NP.eventuality PP.subeventuality»: agent=Affector door=Eventuality with hand=Subeventuality |
| 5 | **wait** | infinitive | Lift doors *not said here* |  |  |  |  | for the next lift | vn exist-47.1 «NP V»: agent=Theme |

<!-- .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: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): R5-strong ×2. **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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