---
title: Our noses sense particular molecules; natural gas has no smell, so c… — Molecules: when atoms join up · tree and pragmatics
description: Our noses sense particular molecules; natural gas has no smell, so companies add a smelly chemical to make leaks noticeable. Who acts: noses, natural gas, companies. A sentence of the lesson «Molecules: when atoms join up» of the chemistry course of Mova's primary school with its dependency tree and
---

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# Molecules: when atoms join up, sentence 13

<!-- .ven lang=en -->
Our noses sense particular molecules; natural gas has no smell, so companies add a smelly chemical to make leaks noticeable.

<!-- .vintro -->
**Who acts:** noses, natural gas, companies · **What happens:** sense, have, add, make · **To what, where:** particular molecules, smell, smelly chemical, leaks

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This is a sentence of the lesson «Molecules: when atoms join up» of the chemistry 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 (noses, natural gas, companies), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:003-molecules-when-atoms-join-up.lesson:13
# text = Our noses sense particular molecules; natural gas has no smell, so companies add a smelly chemical to make leaks noticeable.
# source = school lesson (ours)
# course = chemistry
# lesson = 003-molecules-when-atoms-join-up.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): R2-punct-next ×1, R6-punct-agree ×1, R7-rel-agree ×3
1	Our	our	PRON	PRP$	Case=Gen|Number=Plur|Person=1|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	noses	nose	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	sense	sense	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	particular	particular	ADJ	JJ	Degree=Pos	5	amod	_	_
5	molecules	molecule	NOUN	NNS	Number=Plur	3	obj	_	_
6	;	;	PUNCT	,	_	9	punct	_	Agree=R2-punct-next|Haiku=3:punct
7	natural	natural	ADJ	JJ	Degree=Pos	8	amod	_	_
8	gas	gas	NOUN	NN	Number=Sing	9	nsubj	_	_
9	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	_	Agree=R7-rel-agree|Haiku=3:conj
10	no	no	DET	DT	PronType=Neg	11	det	_	_
11	smell	smell	NOUN	NN	Number=Sing	9	obj	_	_
12	,	,	PUNCT	,	_	15	punct	_	Agree=R6-punct-agree|Haiku=9:punct
13	so	so	ADV	RB	_	15	advmod	_	_
14	companies	company	NOUN	NNS	Number=Plur	15	nsubj	_	_
15	add	add	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	_	Agree=R7-rel-agree|Haiku=3:conj
16	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	_	Agree=R7-rel-agree|Haiku=18:obj
17	smelly	smelly	ADJ	JJ	Degree=Pos	18	amod	_	_
18	chemical	chemical	NOUN	NN	Number=Sing	15	obj	_	_
19	to	to	PART	TO	_	20	mark	_	_
20	make	make	VERB	VB	VerbForm=Inf	15	advcl	_	_
21	leaks	leak	NOUN	NNS	Number=Plur	20	obj	_	_
22	noticeable	noticeable	ADJ	JJ	Degree=Pos	20	xcomp	_	_
23	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: changed polarity=none

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **sense** | present | Our noses | particular molecules |  |  |  |  | vn see-30.1-1 «NP V S»: agent=Experiencer molecule=Stimulus |
| 2 | **have** | present | natural gas | no smell |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent smell=Patient |
| 3 | **add** *speech: assert* | present | companies | a smelly chemical |  |  |  |  | vn mix-22.1-2 «NP V NP»: agent=Agent chemical=Patient |
| 4 | **make** | to-infinitive | companies *not said here* | leaks |  |  |  | noticeable *property* | vn build-26.1-1 «NP.asset V NP»: agent=Asset leak=Product |

<!-- .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:chemistry:003-molecules-when-atoms-join-up.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): R2-punct-next ×1, R6-punct-agree ×1, R7-rel-agree ×3. **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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