Exam question 2 · Day and night, and the Moon's faces

Ascertain the reason for which the same hemisphere of the Moon is perpetually presented to the Earth.

Mova's choice: option 1 · The right answer: option 1 · right ✓ · Who acts: you · What happens: ascertain, present · To what, where: reason, same hemisphere

This is exam question 2 of lesson 39 «Day and night, and the Moon's faces» of the physics course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: the test at school.

The question

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	Ascertain	ascertain	VERB	Mood=Imp VerbForm=Fin	root	root
2	the	the	DET	Definite=Def PronType=Art	3 reason	det
3	reason	reason	NOUN	Number=Sing	1 Ascertain	obj
4	for	for	ADP	_	5 which	case
5	which	which	PRON	PronType=Rel	14 presented	obl
6	the	the	DET	Definite=Def PronType=Art	8 hemisphere	det
7	same	same	ADJ	Degree=Pos	8 hemisphere	amod
8	hemisphere	hemisphere	NOUN	Number=Sing	14 presented	nsubj:pass
9	of	of	ADP	_	11 Moon	case
10	the	the	DET	Definite=Def PronType=Art	11 Moon	det
11	Moon	Moon	PROPN	Number=Sing	8 hemisphere	nmod
12	is	be	AUX	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	14 presented	aux:pass
13	perpetually	perpetually	ADV	_	14 presented	advmod
14	presented	present	VERB	Tense=Past VerbForm=Part Voice=Pass	3 reason	acl:relcl
15	to	to	ADP	_	17 Earth	case
16	the	the	DET	Definite=Def PronType=Art	17 Earth	det
17	Earth	Earth	PROPN	Number=Sing	14 presented	obl
18	.	.	PUNCT	_	1 Ascertain	punct

#	verb	tense, mood	who	what, whom	to whom	where	when	other	roles by
1	ascertain	imperative	you not said here	the reason					vn discover-84 «NP V NP»: agent=Agent reason=Topic
2	present	present · passive		the same hemisphere of the Moon				for the reason; to the Earth; perpetually property	vn fulfilling-13.4.1 «NP V NP PP.recipient»: subject=Theme for which=Recipient

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.

The options

Option 1 · ← Mova's choice · ✓ the right answer

The Moon rotates once upon its axis in each revolution about the Earth

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	The	the	DET	Definite=Def PronType=Art	2 Moon	det
2	Moon	Moon	PROPN	Number=Sing	3 rotates	nsubj
3	rotates	rotate	VERB	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	root	root
4	once	once	ADV	NumForm=Word NumType=Mult	3 rotates	advmod
5	upon	upon	ADP	_	7 axis	case
6	its	its	PRON	Case=Gen Gender=Neut Number=Sing Person=3 Poss=Yes PronType=Prs	7 axis	nmod:poss
7	axis	axis	NOUN	Number=Sing	3 rotates	obl
8	in	in	ADP	_	10 revolution	case
9	each	each	DET	PronType=Tot	10 revolution	det
10	revolution	revolution	NOUN	Number=Sing	3 rotates	obl
11	about	about	ADP	_	13 Earth	case
12	the	the	DET	Definite=Def PronType=Art	13 Earth	det
13	Earth	Earth	PROPN	Number=Sing	10 revolution	nmod

#	verb	tense, mood	who	what, whom	to whom	where	when	other	roles by
1	rotate	present	the Moon			each revolution about the Earth		upon Moon's axis; once property	vn roll-51.3.1 «NP.theme V PP.source PP.trajectory PP.destination»: agent=Theme upon axis=Source in revolution=Trajectory

Option 2

The opposite hemisphere is permanently unlit

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	The	the	DET	Definite=Def PronType=Art	3 hemisphere	det
2	opposite	opposite	ADJ	Degree=Pos	3 hemisphere	amod
3	hemisphere	hemisphere	NOUN	Number=Sing	6 unlit	nsubj
4	is	be	AUX	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	6 unlit	cop
5	permanently	permanently	ADV	_	6 unlit	advmod
6	unlit	unlit	ADJ	Degree=Pos	root	root

#	verb	tense, mood	who	what, whom	to whom	where	when	other	roles by
1	is	present	the opposite hemisphere					permanently, unlit property	tree rules

Option 3

The Moon does not rotate upon its axis at all

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	The	the	DET	Definite=Def PronType=Art	2 Moon	det
2	Moon	Moon	PROPN	Number=Sing	5 rotate	nsubj
3	does	do	AUX	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	5 rotate	aux
4	not	not	PART	Polarity=Neg	5 rotate	advmod
5	rotate	rotate	VERB	VerbForm=Inf	root	root
6	upon	upon	ADP	_	8 axis	case
7	its	its	PRON	Case=Gen Gender=Neut Number=Sing Person=3 Poss=Yes PronType=Prs	8 axis	nmod:poss
8	axis	axis	NOUN	Number=Sing	5 rotate	obl
9	at	at	ADP	_	10 all	case
10	all	all	DET	PronType=Tot	5 rotate	obl

#	verb	tense, mood	who	what, whom	to whom	where	when	other	roles by
1	not rotate	present · do-support	the Moon			all		upon Moon's axis	vn roll-51.3.1 «NP.theme V PP.source PP.trajectory PP.destination»: agent=Theme upon axis=Source at all=Trajectory

Option 4

The Earth obscures the opposite hemisphere

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	The	the	DET	Definite=Def PronType=Art	2 Earth	det
2	Earth	Earth	PROPN	Number=Sing	3 obscures	nsubj
3	obscures	obscure	VERB	Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin	root	root
4	the	the	DET	Definite=Def PronType=Art	6 hemisphere	det
5	opposite	opposite	ADJ	Degree=Pos	6 hemisphere	amod
6	hemisphere	hemisphere	NOUN	Number=Sing	3 obscures	obj

#	verb	tense, mood	who	what, whom	to whom	where	when	other	roles by
1	obscure	present	the Earth	the opposite hemisphere					vn remedy-45.7 «NP V NP.patient»: agent=Agent hemisphere=Patient

Text: the tests of Mova's primary school, written for Mova (world/data/school/), as the course runner gave them to the student. Trees: Mova's own parse — the en model on the CPU, when the site is built — not checked by a teacher; they may be wrong. Frames: Mova's frames reader (prag), each text read on its own. Elamur Cosmic License.

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