---
title: Hot deserts can be very cold at night because dry clear air lets hea… — Deserts, rainforests and grasslands · tree and pragmatics
description: Hot deserts can be very cold at night because dry clear air lets heat escape. Who acts: Hot deserts, dry clear air, heat. A sentence of the lesson «Deserts, rainforests and grasslands» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Deserts, rainforests and grasslands, sentence 14

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Hot deserts can be very cold at night because dry clear air lets heat escape.

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**Who acts:** Hot deserts, dry clear air, heat · **What happens:** be, let, escape · **To what, where:** heat

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This is a sentence of the lesson «Deserts, rainforests and grasslands» of the world 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 (Hot deserts, dry clear air, heat), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:066-deserts-rainforests-grasslands.lesson:14
# text = Hot deserts can be very cold at night because dry clear air lets heat escape.
# source = school lesson (ours)
# course = world
# lesson = 066-deserts-rainforests-grasslands.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	Hot	hot	ADJ	JJ	Degree=Pos	2	amod	_	_
2	deserts	desert	NOUN	NNS	Number=Plur	6	nsubj	_	_
3	can	can	AUX	MD	VerbForm=Fin	6	aux	_	_
4	be	be	AUX	VB	VerbForm=Inf	6	cop	_	_
5	very	very	ADV	RB	_	6	advmod	_	_
6	cold	cold	ADJ	JJ	Degree=Pos	0	root	_	_
7	at	at	ADP	IN	_	8	case	_	_
8	night	night	NOUN	NN	Number=Sing	6	obl	_	_
9	because	because	SCONJ	IN	_	13	mark	_	_
10	dry	dry	ADJ	JJ	Degree=Pos	12	amod	_	_
11	clear	clear	ADJ	JJ	Degree=Pos	12	amod	_	_
12	air	air	NOUN	NN	Number=Sing	13	nsubj	_	_
13	lets	let	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	advcl	_	_
14	heat	heat	NOUN	NN	Number=Sing	13	obj	_	_
15	escape	escape	VERB	VB	VerbForm=Inf	13	xcomp	_	_
16	.	.	PUNCT	.	_	6	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** | can | Hot deserts |  |  |  | night | cold *property* | tree rules |
| 2 | **let** | present | dry clear air | heat |  |  |  |  | tree rules |
| 3 | **escape** | infinitive | heat *not said here* |  |  |  |  |  | vn escape-51.1-1-1 «NP V»: agent=Theme |

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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:world:066-deserts-rainforests-grasslands.lesson:14`.

**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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