---
title: Why does a cardboard box get stronger when you add a corrugated laye… — Building strong things: bridges, tower… · tree and pragmatics
description: Why does a cardboard box get stronger when you add a corrugated layer, a wavy folded sheet, inside its walls? Test 4 · ★★ of lesson 86 «Building strong things: bridges, towers and shapes» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of eac
---

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# Test 4 · ★★ · Building strong things: bridges, towers and shapes

<!-- .ven lang=en -->
Why does a cardboard box get stronger when you add a corrugated layer, a wavy folded sheet, inside its walls?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** cardboard box, you · **What happens:** get, add, corrugate, fold · **To what, where:** corrugated layer, walls

<!-- .vabout -->
This is test 4 · ★★ of lesson 86 «Building strong things: bridges, towers and shapes» of the world 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/world/86-building-strong-things/#t4).

## The question {#question}

```conllu
# sent_id = question:world:86-building-strong-things:t4:1
# text = Why does a cardboard box get stronger when you add a corrugated layer, a wavy folded sheet, inside its walls?
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	cardboard	cardboard	NOUN	NN	Number=Sing	5	compound	_	_
5	box	box	NOUN	NN	Number=Sing	6	nsubj	_	_
6	get	get	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	stronger	strong	ADJ	JJR	Degree=Cmp	6	xcomp	_	_
8	when	when	SCONJ	WRB	_	10	mark	_	_
9	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	10	nsubj	_	_
10	add	add	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	6	advcl	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
12	corrugated	corrugate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	13	amod	_	_
13	layer	layer	NOUN	NN	Number=Sing	10	obj	_	SpaceAfter=No
14	,	,	PUNCT	,	_	16	punct	_	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	_	_
16	wavy	wavy	NOUN	NN	Number=Sing	13	appos	_	_
17	folded	fold	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	18	amod	_	_
18	sheet	sheet	NOUN	NN	Number=Sing	16	conj	_	SpaceAfter=No
19	,	,	PUNCT	,	_	22	punct	_	_
20	inside	inside	ADP	IN	_	22	case	_	_
21	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	22	nmod:poss	_	_
22	walls	wall	NOUN	NNS	Number=Plur	10	obl	_	SpaceAfter=No
23	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **get** | present · do-support | a cardboard box |  |  |  |  | strong *property* | vn comprehend-87.2-1 «NP V S\_ING»: agent=Experiencer |
| 2 | **add** *speech: assert* | present | you | a corrugated layer |  | box's walls |  |  | vn mix-22.1-2 «NP V NP»: agent=Agent layer=Patient |
| 3 | **corrugate** | participle |  |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |
| 4 | **fold** | participle |  |  |  |  |  |  | vn bend-45.2 «NP.patient V»: agent=Patient |

<!-- .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 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
The wavy folds make the card much stiffer

```conllu
# sent_id = question:world:86-building-strong-things:t4:o1:1
# text = The wavy folds make the card much stiffer
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	wavy	wavy	ADJ	JJ	Degree=Pos	3	amod	_	_
3	folds	fold	NOUN	NNS	Number=Plur	4	nsubj	_	_
4	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	card	card	NOUN	NN	Number=Sing	4	obj	_	_
7	much	much	ADV	RB	_	8	advmod	_	_
8	stiffer	stiff	ADJ	JJR	Degree=Cmp	4	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | the wavy folds | the card |  |  |  | stiff *property* | vn build-26.1-1 «NP.asset V NP»: agent=Asset card=Product |

### Option 2 {#o2}

<!-- .ven lang=en -->
The folds make the card much heavier and softer

```conllu
# sent_id = question:world:86-building-strong-things:t4:o2:1
# text = The folds make the card much heavier and softer
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	folds	fold	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	card	card	NOUN	NN	Number=Sing	3	obj	_	_
6	much	much	ADV	RB	_	7	advmod	_	_
7	heavier	heavy	ADJ	JJR	Degree=Cmp	3	xcomp	_	_
8	and	and	CCONJ	CC	_	9	cc	_	_
9	softer	soft	ADJ	JJR	Degree=Cmp	7	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | the folds | the card |  |  |  | heavy *property* | vn build-26.1-1 «NP.asset V NP»: agent=Asset card=Product |

### Option 3 {#o3}

<!-- .ven lang=en -->
The folds keep the box dry

```conllu
# sent_id = question:world:86-building-strong-things:t4:o3:1
# text = The folds keep the box dry
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	folds	fold	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	keep	keep	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	box	box	NOUN	NN	Number=Sing	6	compound	_	_
6	dry	dry	NOUN	NN	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **keep** | present | the folds | the box dry |  |  |  |  | vn keep-15.2 «NP V NP»: agent=Agent dry=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The folds glue the box shut

```conllu
# sent_id = question:world:86-building-strong-things:t4:o4:1
# text = The folds glue the box shut
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	folds	fold	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	glue	glue	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	box	box	NOUN	NN	Number=Sing	3	obj	_	_
6	shut	shut	ADJ	JJ	Degree=Pos	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **glue** | present | the folds | the box |  |  |  | shut *property* | vn tape-22.4 «NP V NP»: agent=Agent box=Patient |

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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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