---
title: Why does a life jacket help even someone who cannot swim? — Floating and sinking: the push of the… · tree and pragmatics
description: Why does a life jacket help even someone who cannot swim? Test 9 of lesson 11 «Floating and sinking: the push of the water» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Test 9 · Floating and sinking: the push of the water

<!-- .ven lang=en -->
Why does a life jacket help even someone who cannot swim?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **Who acts:** life jacket · **What happens:** help, not swim · **To what, where:** someone

<!-- .vabout -->
This is test 9 of lesson 11 «Floating and sinking: the push of the water» of the physics course of Mova's primary school. 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](https://md.mova.elamur.ai/free/en/school-run/physics/11-floating-and-sinking/#t9).

## The question {#question}

```conllu
# sent_id = question:physics:11-floating-and-sinking:t9:1
# text = Why does a life jacket help even someone who cannot swim?
1	Why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	aux	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	life	life	NOUN	NN	Number=Sing	5	compound	_	_
5	jacket	jacket	NOUN	NN	Number=Sing	6	nsubj	_	_
6	help	help	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	even	even	ADV	RB	_	8	advmod	_	_
8	someone	someone	PRON	NN	Number=Sing|PronType=Ind	6	obj	_	_
9	who	who	PRON	WP	PronType=Rel	12	nsubj	_	_
10	can	can	AUX	MD	VerbForm=Fin	12	aux	_	SpaceAfter=No
11	not	not	PART	RB	Polarity=Neg	12	advmod	_	_
12	swim	swim	VERB	VB	VerbForm=Inf	8	acl:relcl	_	SpaceAfter=No
13	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **help** | present · do-support | a life jacket |  | someone |  |  |  | vn help-72.1-1-1 «NP V NP»: agent=Agent someone=Beneficiary |
| 2 | **not** **swim** | can |  |  |  |  |  |  | vn run-51.3.2-1 «NP V»: agent=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.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
It teaches you how to swim as you go along

```conllu
# sent_id = question:physics:11-floating-and-sinking:t9:o1:1
# text = It teaches you how to swim as you go along
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	teaches	teach	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	2	iobj	_	_
4	how	how	ADV	WRB	PronType=Int	6	advmod	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	swim	swim	VERB	VB	VerbForm=Inf	2	xcomp	_	_
7	as	as	SCONJ	IN	_	9	mark	_	_
8	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	9	nsubj	_	_
9	go	go	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	6	advcl	_	_
10	along	along	ADV	RB	_	6	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **teach** *speech: other* | present | It |  | you |  |  |  | vn transfer\_mesg-37.1.1-1-1 «NP V NP S\_INF»: agent=Agent you=Recipient clause=Topic |
| 2 | **swim** | to-infinitive |  |  |  |  |  | along *property* | vn run-51.3.2-1 «NP V»: agent=Theme |
| 3 | **go along** | present | you |  |  |  |  |  | vn disappearance-48.2-1 «NP V»: agent=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
It makes the water shallower

```conllu
# sent_id = question:physics:11-floating-and-sinking:t9:o2:1
# text = It makes the water shallower
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	water	water	NOUN	NN	Number=Sing	2	obj	_	_
5	shallower	shallow	ADJ	JJR	Degree=Cmp	2	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | It | the water |  |  |  | shallow *property* | vn build-26.1-1 «NP.material V NP»: agent=Material water=Product |

### Option 3 {#o3}

<!-- .ven lang=en -->
It makes you lighter than air

```conllu
# sent_id = question:physics:11-floating-and-sinking:t9:o3:1
# text = It makes you lighter than air
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	2	obj	_	_
4	lighter	light	ADJ	JJR	Degree=Cmp	2	xcomp	_	_
5	than	than	ADP	IN	_	6	case	_	_
6	air	air	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | It | you |  |  |  | light *property* | vn build-26.1-1 «NP.material V NP»: agent=Material you=Product |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
It turns you face up and keeps you afloat

```conllu
# sent_id = question:physics:11-floating-and-sinking:t9:o4:1
# text = It turns you face up and keeps you afloat
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	turns	turn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	2	obj	_	_
4	face	face	VERB	VB	VerbForm=Inf	2	xcomp	_	_
5	up	up	ADP	RP	_	4	compound:prt	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	keeps	keep	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
8	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	7	obj	_	_
9	afloat	afloat	ADJ	JJ	Degree=Pos	7	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | present | It | you |  |  |  |  | tree rules |
| 2 | **face up** | infinitive |  |  |  |  |  |  | vn fill-9.8-1 «NP V NP»: agent=Theme |
| 3 | **keep** | present |  | you |  |  |  | afloat *property* | vn keep-15.2 «NP V NP»: agent=Agent you=Theme |

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**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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- ← previous: [Floating and sinking: the push of the…, test 8](https://md.mova.elamur.ai/free/en/corpora/questions/physics/11-floating-and-sinking/t8/)
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