---
title: A solar eclipse can happen only at new Moon and a lunar eclipse only… — Olympiad: planet puzzles ★★★ · tree and pragmatics
description: A solar eclipse can happen only at new Moon and a lunar eclipse only at full Moon; spring tides come at both, so about every two weeks. Who acts: solar eclipse, spring tides. A sentence of the lesson «Olympiad: planet puzzles ★★★» of the space course of Mova's primary school with its dependency tree
---

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# Olympiad: planet puzzles ★★★, sentence 18

<!-- .ven lang=en -->
A solar eclipse can happen only at new Moon and a lunar eclipse only at full Moon; spring tides come at both, so about every two weeks.

<!-- .vintro -->
**Who acts:** solar eclipse, spring tides · **What happens:** happen, come · **To what, where:** new Moon, both

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This is a sentence of the lesson «Olympiad: planet puzzles ★★★» 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 (solar eclipse, spring tides), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:031-olympiad-planet-puzzles.lesson:18
# text = A solar eclipse can happen only at new Moon and a lunar eclipse only at full Moon; spring tides come at both, so about every two weeks.
# source = school lesson (ours)
# course = space
# lesson = 031-olympiad-planet-puzzles.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): R7-rel-agree ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	solar	solar	ADJ	JJ	Degree=Pos	3	amod	_	_
3	eclipse	eclipse	NOUN	NN	Number=Sing	5	nsubj	_	_
4	can	can	AUX	MD	VerbForm=Fin	5	aux	_	_
5	happen	happen	VERB	VB	VerbForm=Inf	0	root	_	_
6	only	only	ADV	RB	_	9	advmod	_	_
7	at	at	ADP	IN	_	9	case	_	_
8	new	new	ADJ	JJ	Degree=Pos	9	amod	_	_
9	Moon	Moon	PROPN	NNP	Number=Sing	5	obl	_	_
10	and	and	CCONJ	CC	_	13	cc	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
12	lunar	lunar	ADJ	JJ	Degree=Pos	13	amod	_	_
13	eclipse	eclipse	NOUN	NN	Number=Sing	5	appos	_	_
14	only	only	ADV	RB	_	5	advmod	_	_
15	at	at	ADP	IN	_	17	case	_	_
16	full	full	ADJ	JJ	Degree=Pos	17	amod	_	_
17	Moon	Moon	PROPN	NNP	Number=Sing	5	obl	_	_
18	;	;	PUNCT	,	_	21	punct	_	_
19	spring	spring	NOUN	NN	Number=Sing	20	compound	_	_
20	tides	tide	NOUN	NNS	Number=Plur	21	nsubj	_	_
21	come	come	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	parataxis	_	Agree=R7-rel-agree|Haiku=5:conj
22	at	at	ADP	IN	_	23	case	_	_
23	both	both	DET	DT	PronType=Tot	21	obl	_	_
24	,	,	PUNCT	,	_	29	punct	_	_
25	so	so	ADV	RB	_	29	advmod	_	_
26	about	about	ADV	RB	_	29	advmod	_	_
27	every	every	DET	DT	PronType=Tot	29	det	_	_
28	two	two	NUM	CD	NumForm=Word|NumType=Card	29	nummod	_	_
29	weeks	week	NOUN	NNS	Number=Plur	21	obl:unmarked	_	_
30	.	.	PUNCT	.	_	5	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 | **happen** | can | a solar eclipse |  |  | new Moon |  | at full Moon | vn occur-48.3-1 «NP V PP»: agent=Theme at moon=Location |
| 2 | **come** | present | spring tides |  |  | both | week |  | vn appear-48.1.1 «NP V PP.location»: agent=Theme at both=Location |

<!-- .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:space:031-olympiad-planet-puzzles.lesson:18`.

**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): R7-rel-agree ×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](https://md.mova.elamur.ai/free/en/releases/0.4/).

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