---
title: Then, step by step, cities learned to keep people alive: a doctor in… — Cities: why they grow, and how water and sewers… · tree and pragmatics
description: Then, step by step, cities learned to keep people alive: a doctor in London mapped where people fell ill and found a poisoned water pump, an engineer built huge sewers after a summer called the Great Stink, and new rules followed fires and floods. Who acts: cities, people, engineer, summer. A senten
---

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# Cities: why they grow, and how water and sewers made them safe, sentence 2

<!-- .ven lang=en -->
Then, step by step, cities learned to keep people alive: a doctor in London mapped where people fell ill and found a poisoned water pump, an engineer built huge sewers after a summer called the Great Stink, and new rules followed fires and floods.

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**Who acts:** cities, people, engineer, summer, step · **What happens:** learn, keep, map, fall, find, poison · **To what, where:** step, people, doctor, poisoned water pump, huge sewers, Great Stink · **Speech:** someone speaks here

<!-- .vabout -->
This is a sentence of the lesson «Cities: why they grow, and how water and sewers made them safe» of the history 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 (cities, people, engineer, summer), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:history:073-cities-why-they-grow-and-how-sewers-made-them-safe.lesson:2
# text = Then, step by step, cities learned to keep people alive: a doctor in London mapped where people fell ill and found a poisoned water pump, an engineer built huge sewers after a summer called the Great Stink, and new rules followed fires and floods.
# source = school lesson (ours)
# course = history
# lesson = 073-cities-why-they-grow-and-how-sewers-made-them-safe.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): R7-rel-agree ×2, R8-pos-agree ×1
1	Then	then	ADV	RB	PronType=Dem	8	advmod	_	_
2	,	,	PUNCT	,	_	1	punct	_	_
3	step	step	NOUN	NN	Number=Sing	8	obl	_	_
4	by	by	ADP	IN	_	5	case	_	_
5	step	step	NOUN	NN	Number=Sing	3	nmod	_	_
6	,	,	PUNCT	,	_	8	punct	_	_
7	cities	city	NOUN	NNS	Number=Plur	8	nsubj	_	_
8	learned	learn	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	0	root	_	_
9	to	to	PART	TO	_	10	mark	_	_
10	keep	keep	VERB	VB	VerbForm=Inf	8	xcomp	_	_
11	people	people	NOUN	NNS	Number=Plur	10	obj	_	_
12	alive	alive	ADJ	JJ	Degree=Pos	10	xcomp	_	_
13	:	:	PUNCT	:	_	18	punct	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
15	doctor	doctor	NOUN	NN	Number=Sing	18	nsubj:pass	_	_
16	in	in	ADP	IN	_	17	case	_	_
17	London	London	PROPN	NNP	Number=Sing	15	nmod	_	_
18	mapped	map	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	8	parataxis	_	Agree=R7-rel-agree|Haiku=8:advcl|HaikuPos=VERB:VBN:Tense=Past|VerbForm=Part|Voice=Pass
19	where	where	ADV	WRB	PronType=Rel	21	advmod	_	_
20	people	people	NOUN	NNS	Number=Plur	21	nsubj	_	_
21	fell	fall	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	18	advcl	_	_
22	ill	ill	ADJ	JJ	Degree=Pos	21	xcomp	_	Agree=R7-rel-agree|Haiku=21:advmod|HaikuPos=ADV:RB:_
23	and	and	CCONJ	CC	_	24	cc	_	_
24	found	find	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	21	conj	_	_
25	a	a	DET	DT	Definite=Ind|PronType=Art	28	det	_	_
26	poisoned	poison	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	28	amod	_	_
27	water	water	NOUN	NN	Number=Sing	28	compound	_	_
28	pump	pump	NOUN	NN	Number=Sing	24	obj	_	_
29	,	,	PUNCT	,	_	31	punct	_	_
30	an	a	DET	DT	Definite=Ind|PronType=Art	31	det	_	_
31	engineer	engineer	NOUN	NN	Number=Sing	28	appos	_	_
32	built	build	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	31	acl	_	_
33	huge	huge	ADJ	JJ	Degree=Pos	34	amod	_	_
34	sewers	sewer	NOUN	NNS	Number=Plur	32	obj	_	_
35	after	after	ADP	IN	_	37	case	_	_
36	a	a	DET	DT	Definite=Ind|PronType=Art	37	det	_	_
37	summer	summer	NOUN	NN	Number=Sing	32	obl	_	_
38	called	call	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	37	acl	_	_
39	the	the	DET	DT	Definite=Def|PronType=Art	41	det	_	_
40	Great	great	ADJ	JJ	Degree=Pos	41	amod	_	_
41	Stink	stink	NOUN	NN	Number=Sing	38	xcomp	_	_
42	,	,	PUNCT	,	_	46	punct	_	_
43	and	and	CCONJ	CC	_	46	cc	_	_
44	new	new	ADJ	JJ	Degree=Pos	45	amod	_	_
45	rules	rule	NOUN	NNS	Number=Plur	46	nsubj:pass	_	_
46	followed	follow	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	18	conj	_	Agree=R8-pos-agree|Haiku=18:conj|HaikuPos=VERB:VBN:Tense=Past|VerbForm=Part|Voice=Pass
47	fires	fire	NOUN	NNS	Number=Plur	46	obj	_	_
48	and	and	CCONJ	CC	_	49	cc	_	_
49	floods	flood	NOUN	NNS	Number=Plur	47	conj	_	_
50	.	.	PUNCT	.	_	8	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **learn** | past | cities | step by step |  |  | then |  | vn learn-14-2-1 «NP V that S»: agent=Agent clause=Topic |
| 2 | **keep** | to-infinitive | cities *not said here* | people |  |  |  | alive *property* | vn keep-15.2 «NP V NP»: agent=Agent people=Theme |
| 3 | **map** | past · passive |  | a doctor in London |  |  |  |  | tree rules |
| 4 | **fall** | past | people |  |  |  |  | ill *property* | vn occur-48.3 «NP V»: agent=Theme |
| 5 | **find** | past | people *not said here* | a poisoned water pump |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent pump=Topic |
| 6 | **poison** | participle |  |  |  |  |  |  | vn poison-42.2 «NP V NP»: agent=Agent |
| 7 | **build** | participle | a engineer *not said here* | huge sewers |  |  | summer |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset sewer=Product |
| 8 | **call** | participle | a summer *not said here* | the Great Stink |  |  |  |  | vn initiate\_communication-37.4.2-1 «NP V»: agent=Agent |
| 9 | **follow** | past · passive |  | new rules |  |  |  |  | vn assessment-34.1 «NP V NP.attribute»: subject=Theme fire=Attribute |
| 10 | **step** |  | step |  |  |  |  |  | nom step «act transitive»: by=agent |

<!-- .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:history:073-cities-why-they-grow-and-how-sewers-made-them-safe.lesson:2`.

**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): R7-rel-agree ×2, R8-pos-agree ×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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