---
title: If you stretch a rubber band and let go, and then do the same with a… — Plastics: useful and stubborn · tree and pragmatics
description: If you stretch a rubber band and let go, and then do the same with a plastic bag strip, what's different? Test 3 of lesson 29 «Plastics: useful and stubborn» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice wa
---

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# Test 3 · Plastics: useful and stubborn

<!-- .ven lang=en -->
If you stretch a rubber band and let go, and then do the same with a plastic bag strip, what's different?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you, plastic bag strip · **What happens:** stretch, let, go, do, be · **To what, where:** rubber band, same

<!-- .vabout -->
This is test 3 of lesson 29 «Plastics: useful and stubborn» of the chemistry 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/chemistry/29-plastics-useful-stubborn/#t3).

## The question {#question}

```conllu
# sent_id = question:chemistry:29-plastics-useful-stubborn:t3:1
# text = If you stretch a rubber band and let go, and then do the same with a plastic bag strip, what's different?
1	If	if	SCONJ	IN	_	3	mark	_	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	3	nsubj	_	_
3	stretch	stretch	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
5	rubber	rubber	NOUN	NN	Number=Sing	6	compound	_	_
6	band	band	NOUN	NN	Number=Sing	3	obj	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	let	let	VERB	VB	VerbForm=Inf	3	conj	_	_
9	go	go	VERB	VB	VerbForm=Inf	8	xcomp	_	SpaceAfter=No
10	,	,	PUNCT	,	_	13	punct	_	_
11	and	and	CCONJ	CC	_	13	cc	_	_
12	then	then	ADV	RB	PronType=Dem	13	advmod	_	_
13	do	do	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	same	same	ADJ	JJ	Degree=Pos	13	obj	_	_
16	with	with	ADP	IN	_	20	case	_	_
17	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	_
18	plastic	plastic	ADJ	JJ	Degree=Pos	20	amod	_	_
19	bag	bag	NOUN	NN	Number=Sing	20	compound	_	_
20	strip	strip	NOUN	NN	Number=Sing	13	obl	_	SpaceAfter=No
21	,	,	PUNCT	,	_	24	punct	_	_
22	what	what	PRON	WP	PronType=Int	24	nsubj	_	SpaceAfter=No
23	's	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	24	cop	_	_
24	different	different	ADJ	JJ	Degree=Pos	20	conj	_	SpaceAfter=No
25	?	?	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **stretch** | present | you | a rubber band |  |  |  |  | vn bend-45.2 «NP V NP.patient»: agent=Agent band=Patient |
| 2 | **let** | infinitive | you *not said here* |  |  |  |  |  | tree rules |
| 3 | **go** | infinitive | you *not said here* |  |  |  |  |  | vn disappearance-48.2-1 «NP V»: agent=Theme |
| 4 | **do** | present | you *not said here* | the same |  |  | then | with a plastic bag strip | vn act-114-1 «NP V NP»: agent=Agent same=Eventuality |
| 5 | **is** | present | a plastic bag strip |  |  |  |  | different *property* | tree rules |

<!-- .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 band springs back, the bag stays stretched

```conllu
# sent_id = question:chemistry:29-plastics-useful-stubborn:t3:o1:1
# text = The band springs back, the bag stays stretched
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	band	band	NOUN	NN	Number=Sing	3	nsubj	_	_
3	springs	spring	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	back	back	ADV	RB	_	3	advmod	_	SpaceAfter=No
5	,	,	PUNCT	,	_	8	punct	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	bag	bag	NOUN	NN	Number=Sing	8	nsubj	_	_
8	stays	stay	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
9	stretched	stretch	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	8	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **spring back** | present | the band |  |  |  |  |  | vn run-51.3.2 «NP V»: agent=Theme |
| 2 | **stay** | present | the bag |  |  |  |  |  | tree rules |
| 3 | **stretch** | participle | the bag *not said here* |  |  |  |  |  | vn bend-45.2 «NP.patient V»: agent=Patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
Both spring back the same way

```conllu
# sent_id = question:chemistry:29-plastics-useful-stubborn:t3:o2:1
# text = Both spring back the same way
1	Both	both	DET	DT	PronType=Tot	2	nsubj	_	_
2	spring	spring	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	back	back	ADV	RB	_	2	advmod	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	same	same	ADJ	JJ	Degree=Pos	6	amod	_	_
6	way	way	NOUN	NN	Number=Sing	2	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **spring back** | present | Both | the same way |  |  |  |  | vn run-51.3.2 «NP V»: agent=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
Both stay stretched the same way

```conllu
# sent_id = question:chemistry:29-plastics-useful-stubborn:t3:o3:1
# text = Both stay stretched the same way
1	Both	both	DET	DT	PronType=Tot	3	nsubj:pass	_	_
2	stay	stay	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	stretched	stretch	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	same	same	ADJ	JJ	Degree=Pos	6	amod	_	_
6	way	way	NOUN	NN	Number=Sing	3	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **stretch** | present · passive |  | Both |  |  |  | the same way *obl:unmarked* | vn bend-45.2 «NP V NP.patient»: subject=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
The bag springs back, the band stays long

```conllu
# sent_id = question:chemistry:29-plastics-useful-stubborn:t3:o4:1
# text = The bag springs back, the band stays long
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	bag	bag	NOUN	NN	Number=Sing	3	nsubj	_	_
3	springs	spring	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	back	back	ADV	RB	_	3	advmod	_	SpaceAfter=No
5	,	,	PUNCT	,	_	8	punct	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	band	band	NOUN	NN	Number=Sing	8	nsubj	_	_
8	stays	stay	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
9	long	long	ADJ	JJ	Degree=Pos	8	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **spring back** | present | the bag |  |  |  |  |  | vn run-51.3.2 «NP V»: agent=Theme |
| 2 | **stay** | present | the band |  |  |  |  | long *property* | vn exist-47.1 «NP V»: agent=Theme |

<!-- div src -->

**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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