Mars, sentence 12

No life has been found on Mars, but in 2025 scientists reported that a Perseverance rock sample has chemical patterns that could be a possible sign of ancient microbes; this is not proof.

Who acts: scientists, Perseverance rock sample, chemical patterns, this · What happens: find, report, have, be, not be · To what, where: life, Mars, 2025, chemical patterns, possible sign, proof

This is a sentence of the lesson «Mars» of the space 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 (scientists, Perseverance rock sample, chemical patterns, this), what happens, when and where, as Mova's frames read it from the tree.

The tree

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	No	no	DET	PronType=Neg	2 life	det
2	life	life	NOUN	Number=Sing	5 found	nsubj:pass
3	has	have	AUX	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	5 found	aux
4	been	be	AUX	Tense=Past VerbForm=Part	5 found	aux:pass
5	found	find	VERB	Tense=Past VerbForm=Part Voice=Pass	root	root
6	on	on	ADP	_	7 Mars	case
7	Mars	Mars	PROPN	Number=Sing	5 found	obl
8	,	,	PUNCT	_	13 reported	punct
9	but	but	CCONJ	_	13 reported	cc
10	in	in	ADP	_	11 2025	case
11	2025	2025	NUM	NumForm=Digit NumType=Card	13 reported	obl
12	scientists	scientist	NOUN	Number=Plur	13 reported	nsubj
13	reported	report	VERB	Mood=Ind Number=Sing Person=3 Tense=Past VerbForm=Fin	5 found	conj
14	that	that	SCONJ	_	19 has	mark
15	a	a	DET	Definite=Ind PronType=Art	18 sample	det
16	Perseverance	perseverance	NOUN	Number=Sing	18 sample	compound
17	rock	rock	NOUN	Number=Sing	18 sample	compound
18	sample	sample	NOUN	Number=Sing	19 has	nsubj
19	has	have	VERB	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	13 reported	ccomp
20	chemical	chemical	ADJ	Degree=Pos	21 patterns	amod
21	patterns	pattern	NOUN	Number=Plur	19 has	obj
22	that	that	PRON	PronType=Rel	27 sign	nsubj
23	could	could	AUX	VerbForm=Fin	27 sign	aux
24	be	be	AUX	VerbForm=Inf	27 sign	cop
25	a	a	DET	Definite=Ind PronType=Art	27 sign	det
26	possible	possible	ADJ	Degree=Pos	27 sign	amod
27	sign	sign	NOUN	Number=Sing	21 patterns	acl:relcl
28	of	of	ADP	_	30 microbes	case
29	ancient	ancient	ADJ	Degree=Pos	30 microbes	amod
30	microbes	microbe	NOUN	Number=Plur	27 sign	nmod
31	;	;	PUNCT	_	35 proof	punct
32	this	this	PRON	Number=Sing PronType=Dem	35 proof	nsubj
33	is	be	AUX	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	35 proof	cop
34	not	not	PART	Polarity=Neg	35 proof	advmod
35	proof	proof	NOUN	Number=Sing	5 found	parataxis
36	.	.	PUNCT	_	5 found	punct

Pragmatics

No stored speech act for this sentence.

#	verb	tense, mood	who	what, whom	where	other	roles by
1	find	present · perfect · passive		no life	Mars		vn discover-84 «NP V NP»: subject=Topic
2	report	past	scientists		2025		vn characterize-29.2-1-2 «NP V NP»: agent=Agent clause=Theme
3	have	present	a Perseverance rock sample	chemical patterns			vn birth-28.2-1 «NP V NP»: agent=Agent pattern=Patient
4	is a	could	chemical patterns	a possible sign		of ancient microbes	tree rules
5	not is a	present	this	proof			tree rules

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.

Licence: CC 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:space:008-mars.lesson:12.

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 ×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.

This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/space/8-mars/12/