---
title: The extra quarter of a day each year is why we add a leap day, 29 Fe… — The Earth as a planet · tree and pragmatics
description: The extra quarter of a day each year is why we add a leap day, 29 February, about every four years. Who acts: extra quarter, we. A sentence of the lesson «The Earth as a planet» of the space course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# The Earth as a planet, sentence 9

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The extra quarter of a day each year is why we add a leap day, 29 February, about every four years.

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**Who acts:** extra quarter, we · **What happens:** be, add

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This is a sentence of the lesson «The Earth as a planet» 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 (extra quarter, we), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:005-the-earth-as-a-planet.lesson:9
# text = The extra quarter of a day each year is why we add a leap day, 29 February, about every four years.
# source = school lesson (ours)
# course = space
# lesson = 005-the-earth-as-a-planet.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): no change
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	extra	extra	ADJ	JJ	Degree=Pos	3	amod	_	_
3	quarter	quarter	NOUN	NN	Number=Sing	10	nsubj	_	_
4	of	of	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	day	day	NOUN	NN	Number=Sing	3	nmod	_	_
7	each	each	DET	DT	PronType=Tot	8	det	_	_
8	year	year	NOUN	NN	Number=Sing	6	nmod:unmarked	_	_
9	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	_	_
10	why	why	ADV	WRB	PronType=Rel	0	root	_	_
11	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	12	nsubj	_	_
12	add	add	VERB	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	10	advcl:relcl	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
14	leap	leap	NOUN	NN	Number=Sing	15	compound	_	_
15	day	day	NOUN	NN	Number=Sing	12	obj	_	_
16	,	,	PUNCT	,	_	15	punct	_	_
17	29	29	NUM	CD	NumForm=Digit|NumType=Card	15	appos	_	_
18	February	February	PROPN	NNP	Number=Sing	17	flat	_	_
19	,	,	PUNCT	,	_	15	punct	_	_
20	about	about	ADV	RB	_	23	advmod	_	_
21	every	every	DET	DT	PronType=Tot	23	det	_	_
22	four	four	NUM	CD	NumForm=Word|NumType=Card	23	nummod	_	_
23	years	year	NOUN	NNS	Number=Plur	12	obl	_	_
24	.	.	PUNCT	.	_	10	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the extra quarter of a day  each year |  |  |  |  | why *property* | tree rules |
| 2 | **add** *speech: assert* | present | we |  |  |  | day; year |  | vn mix-22.1-2 «NP V NP»: agent=Agent |

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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:005-the-earth-as-a-planet.lesson:9`.

**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): no change. **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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