---
title: Blue-green scum on a lake can be poisonous algae, so do not swim and… — Safe at lakes and beaches · tree and pragmatics
description: Blue-green scum on a lake can be poisonous algae, so do not swim and keep dogs out. Who acts: Blue green scum. A sentence of the lesson «Safe at lakes and beaches» of the everyday course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Safe at lakes and beaches, sentence 10

<!-- .ven lang=en -->
Blue-green scum on a lake can be poisonous algae, so do not swim and keep dogs out.

<!-- .vintro -->
**Who acts:** Blue green scum · **What happens:** be, not swim, keep out · **To what, where:** poisonous algae, dogs

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This is a sentence of the lesson «Safe at lakes and beaches» of the everyday 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 (Blue green scum), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:everyday:232-lakes-and-beaches.lesson:10
# text = Blue-green scum on a lake can be poisonous algae, so do not swim and keep dogs out.
# source = school lesson (ours)
# course = everyday
# lesson = 232-lakes-and-beaches.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	Blue	blue	ADJ	JJ	Degree=Pos	4	amod	_	_
2	-	-	PUNCT	HYPH	_	1	punct	_	_
3	green	green	ADJ	JJ	Degree=Pos	4	amod	_	_
4	scum	scum	NOUN	NN	Number=Sing	11	nsubj	_	_
5	on	on	ADP	IN	_	7	case	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	lake	lake	NOUN	NN	Number=Sing	4	nmod	_	_
8	can	can	AUX	MD	VerbForm=Fin	11	aux	_	_
9	be	be	AUX	VB	VerbForm=Inf	11	cop	_	_
10	poisonous	poisonous	ADJ	JJ	Degree=Pos	11	amod	_	_
11	algae	alga	NOUN	NNS	Number=Plur	0	root	_	_
12	,	,	PUNCT	,	_	16	punct	_	_
13	so	so	ADV	RB	_	16	advmod	_	_
14	do	do	AUX	VB	Mood=Imp|VerbForm=Fin	16	aux	_	_
15	not	not	PART	RB	Polarity=Neg	16	advmod	_	_
16	swim	swim	VERB	VB	Mood=Imp|VerbForm=Fin	11	parataxis	_	_
17	and	and	CCONJ	CC	_	18	cc	_	_
18	keep	keep	VERB	VB	Mood=Imp|VerbForm=Fin	16	conj	_	_
19	dogs	dog	NOUN	NNS	Number=Plur	18	obj	_	_
20	out	out	ADV	RB	_	18	advmod	_	_
21	.	.	PUNCT	.	_	11	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- form: statement
- act: warn
- voice: narrator
- polarity: none
- teacher: changed act=warn

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | can | Blue green scum on a lake | poisonous algae |  |  |  |  | tree rules |
| 2 | **not** **swim** | infinitive · do-support |  |  |  |  |  |  | vn run-51.3.2-1 «NP V»: agent=Theme |
| 3 | **keep out** | infinitive |  | dogs |  |  |  | out *property* | vn keep-15.2 «NP V NP»: agent=Agent dog=Theme |

<!-- .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:everyday:232-lakes-and-beaches.lesson:10`.

**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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- ← previous: [Safe at lakes and beaches, 9](https://md.mova.elamur.ai/free/en/corpora/school/everyday/232-lakes-and-beaches/9/)
- next →: [Safe at lakes and beaches, 11](https://md.mova.elamur.ai/free/en/corpora/school/everyday/232-lakes-and-beaches/11/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/everyday/232-lakes-and-beaches/)