---
title: In airless marsh mud, bacteria rot dead plants and make methane and… — Swamps, marshes, mangroves and bogs · tree and pragmatics
description: In airless marsh mud, bacteria rot dead plants and make methane and smelly hydrogen sulphide, the rotten-egg smell; old stories of will-o'-the-wisp lights may come from marsh gas, but scientists are not sure. Who acts: bacteria, old stories, wisp lights, scientists. A sentence of the lesson «Swamps,
---

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# Swamps, marshes, mangroves and bogs, sentence 15

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In airless marsh mud, bacteria rot dead plants and make methane and smelly hydrogen sulphide, the rotten-egg smell; old stories of will-o'-the-wisp lights may come from marsh gas, but scientists are not sure.

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**Who acts:** bacteria, old stories, wisp lights, scientists · **What happens:** rot, make, o, come, not be · **To what, where:** dead plants, airless marsh mud, methane, marsh gas

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This is a sentence of the lesson «Swamps, marshes, mangroves and bogs» of the biology 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 (bacteria, old stories, wisp lights, scientists), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:011-swamps-marshes-mangroves-and-bogs.lesson:15
# text = In airless marsh mud, bacteria rot dead plants and make methane and smelly hydrogen sulphide, the rotten-egg smell; old stories of will-o'-the-wisp lights may come from marsh gas, but scientists are not sure.
# source = school lesson (ours)
# course = biology
# lesson = 011-swamps-marshes-mangroves-and-bogs.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): R3-conj-first ×1, R5-strong ×2, R8-pos-agree ×2
1	In	in	ADP	IN	_	4	case	_	_
2	airless	airless	ADJ	JJ	Degree=Pos	4	amod	_	_
3	marsh	marsh	NOUN	NN	Number=Sing	4	compound	_	_
4	mud	mud	NOUN	NN	Number=Sing	7	obl	_	_
5	,	,	PUNCT	,	_	7	punct	_	_
6	bacteria	bacterium	NOUN	NNS	Number=Plur	7	nsubj	_	Agree=R8-pos-agree|Haiku=7:nsubj|HaikuPos=NOUN:NN:Number=Sing
7	rot	rot	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
8	dead	dead	ADJ	JJ	Degree=Pos	9	amod	_	_
9	plants	plant	NOUN	NNS	Number=Plur	7	obj	_	_
10	and	and	CCONJ	CC	_	11	cc	_	_
11	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	conj	_	_
12	methane	methane	NOUN	NN	Number=Sing	11	obj	_	_
13	and	and	CCONJ	CC	_	16	cc	_	_
14	smelly	smelly	ADJ	JJ	Degree=Pos	16	amod	_	_
15	hydrogen	hydrogen	NOUN	NN	Number=Sing	16	compound	_	_
16	sulphide	sulphide	NOUN	NN	Number=Sing	12	conj	_	_
17	,	,	PUNCT	,	_	22	punct	_	_
18	the	the	DET	DT	Definite=Def|PronType=Art	22	det	_	_
19	rotten	rotten	ADJ	JJ	Degree=Pos	21	amod	_	Agree=R5-strong|Haiku=22:amod
20	-	-	PUNCT	HYPH	_	19	punct	_	_
21	egg	egg	NOUN	NN	Number=Sing	22	compound	_	_
22	smell	smell	NOUN	NN	Number=Sing	12	conj	_	_
23	;	;	PUNCT	:	_	29	punct	_	_
24	old	old	ADJ	JJ	Degree=Pos	25	amod	_	_
25	stories	story	NOUN	NNS	Number=Plur	29	nsubj	_	_
26	of	of	SCONJ	IN	_	27	mark	_	_
27	will	will	AUX	MD	VerbForm=Fin	29	aux	_	_
28	-	-	PUNCT	HYPH	_	27	punct	_	_
29	o	o	VERB	VB	VerbForm=Inf	11	parataxis	_	_
30	'	'	PUNCT	''	_	29	punct	_	_
31	-	-	PUNCT	HYPH	_	37	punct	_	Agree=R8-pos-agree|Haiku=37:punct|HaikuPos=PUNCT:,:_
32	the	the	DET	DT	Definite=Def|PronType=Art	34	det	_	Agree=R5-strong|Haiku=35:det
33	-	-	PUNCT	HYPH	_	32	punct	_	_
34	wisp	wisp	NOUN	NN	Number=Sing	35	compound	_	_
35	lights	light	NOUN	NNS	Number=Plur	37	nsubj	_	_
36	may	may	AUX	MD	VerbForm=Fin	37	aux	_	_
37	come	come	VERB	VB	VerbForm=Inf	7	conj	_	Agree=R3-conj-first|Haiku=11:conj
38	from	from	ADP	IN	_	40	case	_	_
39	marsh	marsh	NOUN	NN	Number=Sing	40	compound	_	_
40	gas	gas	NOUN	NN	Number=Sing	37	obl	_	_
41	,	,	PUNCT	,	_	46	punct	_	_
42	but	but	CCONJ	CC	_	46	cc	_	_
43	scientists	scientist	NOUN	NNS	Number=Plur	46	nsubj	_	_
44	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	46	cop	_	_
45	not	not	PART	RB	Polarity=Neg	46	advmod	_	_
46	sure	sure	ADJ	JJ	Degree=Pos	11	conj	_	_
47	.	.	PUNCT	.	_	7	punct	_	_
```

## Pragmatics {#pragmatics}

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No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **rot** | present | bacteria | dead plants |  | airless marsh mud |  |  | tree rules |
| 2 | **make** | present | bacteria *not said here* | methane and smelly hydrogen sulphide and the egg smell |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset methane=Product |
| 3 | **o** | future | old stories |  |  |  |  |  | tree rules |
| 4 | **come** | may | wisp lights |  |  | marsh gas |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme from gas=Initial\_Location |
| 5 | **not** **is** | present | scientists |  |  |  |  | sure *property* | tree rules |

<!-- .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:biology:011-swamps-marshes-mangroves-and-bogs.lesson:15`.

**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): R3-conj-first ×1, R5-strong ×2, R8-pos-agree ×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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