---
title: A snake smells with its tongue: it flicks the forked tongue out, cat… — Snakes and lizards · tree and pragmatics
description: A snake smells with its tongue: it flicks the forked tongue out, catches scent particles and carries them to a special organ in the roof of its mouth, and the two tips tell it which side the smell is stronger on. Who acts: snake, tread, two tips, smell. A sentence of the lesson «Snakes and lizards» 
---

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# Snakes and lizards, sentence 1

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A snake smells with its tongue: it flicks the forked tongue out, catches scent particles and carries them to a special organ in the roof of its mouth, and the two tips tell it which side the smell is stronger on.

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**Who acts:** snake, tread, two tips, smell · **What happens:** smell, flick out, fork, catch, carry, tell · **To what, where:** forked tongue, scent particles, Snakes, special organ, side, tread · **Speech:** someone speaks here

<!-- .vabout -->
This is a sentence of the lesson «Snakes and lizards» 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 (snake, tread, two tips, smell), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:030-snakes-and-lizards.lesson:1
# text = A snake smells with its tongue: it flicks the forked tongue out, catches scent particles and carries them to a special organ in the roof of its mouth, and the two tips tell it which side the smell is stronger on.
# source = school lesson (ours)
# course = biology
# lesson = 030-snakes-and-lizards.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, R6-punct-agree ×1, R7-rel-agree ×1, R8-pos-agree ×2
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	snake	snake	NOUN	NN	Number=Sing	3	nsubj	_	_
3	smells	smell	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	with	with	ADP	IN	_	6	case	_	_
5	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	tongue	tongue	NOUN	NN	Number=Sing	3	obl	_	_
7	:	:	PUNCT	:	_	9	punct	_	_
8	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
9	flicks	flick	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	_	Agree=R7-rel-agree|Haiku=3:conj
10	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
11	forked	fork	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	12	amod	_	Agree=R8-pos-agree|Haiku=12:amod|HaikuPos=ADJ:JJ:_
12	tongue	tongue	NOUN	NN	Number=Sing	9	obj	_	_
13	out	out	ADP	RP	_	9	compound:prt	_	_
14	,	,	PUNCT	,	_	15	punct	_	Agree=R6-punct-agree|Haiku=16:punct
15	catches	catch	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	conj	_	_
16	scent	scent	NOUN	NN	Number=Sing	17	compound	_	_
17	particles	particle	NOUN	NNS	Number=Plur	15	obj	_	_
18	and	and	CCONJ	CC	_	19	cc	_	_
19	carries	carry	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	conj	_	Agree=R3-conj-first|Haiku=15:conj
20	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	19	obj	_	_
21	to	to	ADP	IN	_	24	case	_	_
22	a	a	DET	DT	Definite=Ind|PronType=Art	24	det	_	_
23	special	special	ADJ	JJ	Degree=Pos	24	amod	_	_
24	organ	organ	NOUN	NN	Number=Sing	19	obl	_	_
25	in	in	ADP	IN	_	27	case	_	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	_	_
27	roof	roof	NOUN	NN	Number=Sing	24	nmod	_	_
28	of	of	ADP	IN	_	30	case	_	_
29	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	30	nmod:poss	_	_
30	mouth	mouth	NOUN	NN	Number=Sing	27	nmod	_	_
31	,	,	PUNCT	,	_	36	punct	_	_
32	and	and	CCONJ	CC	_	36	cc	_	_
33	the	the	DET	DT	Definite=Def|PronType=Art	35	det	_	_
34	two	two	NUM	CD	NumForm=Word|NumType=Card	35	nummod	_	_
35	tips	tip	NOUN	NNS	Number=Plur	36	nsubj	_	_
36	tell	tell	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	Agree=R8-pos-agree|Haiku=3:conj|HaikuPos=VERB:VB:VerbForm=Inf
37	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	36	iobj	_	_
38	which	which	DET	WDT	PronType=Rel	39	det	_	_
39	side	side	NOUN	NN	Number=Sing	36	obj	_	_
40	the	the	DET	DT	Definite=Def|PronType=Art	41	det	_	_
41	smell	smell	NOUN	NN	Number=Sing	43	nsubj	_	_
42	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	43	cop	_	_
43	stronger	strong	ADJ	JJR	Degree=Cmp	39	acl:relcl	_	_
44	on	on	ADV	RB	_	43	advmod	_	_
45	.	.	PUNCT	.	_	3	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 | **smell** | present | a snake |  |  |  |  | with tread's tongue | vn smell\_emission-43.3 «NP.location V»: agent=Location |
| 2 | **flick out** | present | tread | the forked tongue |  |  |  |  | vn throw-17.1-1 «NP V NP»: agent=Agent tongue=Theme |
| 3 | **fork** | participle |  |  |  |  |  |  | vn pocket-9.10 «NP V NP.theme»: agent=Agent |
| 4 | **catch** | present | tread *not said here* | scent particles |  |  |  |  | vn get-13.5.1 «NP V NP»: agent=Agent particle=Theme |
| 5 | **carry** | present | tread *not said here* | Snakes *= snake* |  | a special organ in the roof of tread's mouth |  |  | vn carry-11.4 «NP V NP PP.destination»: agent=Agent they=Theme to organ=Destination |
| 6 | **tell** *speech: assert* | present | the two tips | which side | tread |  |  |  | vn transfer\_mesg-37.1.1-1-1 «NP V NP-Dative NP»: agent=Agent it=Recipient side=Topic |
| 7 | **is** | present | the smell | which side *not said here* |  |  |  | strong *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:030-snakes-and-lizards.lesson:1`.

**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, R6-punct-agree ×1, R7-rel-agree ×1, 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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