---
title: You have a mixture of iron nails and sand. What is the easiest way t… — Forces — pushes, pulls, friction and m… · tree and pragmatics
description: You have a mixture of iron nails and sand. What is the easiest way to separate them? Test 4 of lesson 51 «Forces — pushes, pulls, friction and magnets» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 4 · Forces — pushes, pulls, friction and magnets

<!-- .ven lang=en -->
You have a mixture of iron nails and sand. What is the easiest way to separate them?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 2 · wrong ✗ · **Who acts:** You, easiest way · **What happens:** have, be, separate · **To what, where:** mixture, nails

<!-- .vabout -->
This is test 4 of lesson 51 «Forces — pushes, pulls, friction and magnets» 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/51-forces/#t4).

## The question {#question}

<!-- .note -->
*Sentence 1:* You have a mixture of iron nails and sand.

```conllu
# sent_id = question:world:51-forces:t4:1
# text = You have a mixture of iron nails and sand.
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	2	nsubj	_	_
2	have	have	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	mixture	mixture	NOUN	NN	Number=Sing	2	obj	_	_
5	of	of	ADP	IN	_	7	case	_	_
6	iron	iron	NOUN	NN	Number=Sing	7	compound	_	_
7	nails	nail	NOUN	NNS	Number=Plur	4	nmod	_	_
8	and	and	CCONJ	CC	_	9	cc	_	_
9	sand	sand	NOUN	NN	Number=Sing	7	conj	_	SpaceAfter=No
10	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | You | a mixture of iron nails and sand |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent mixture=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.

<!-- .note -->
*Sentence 2:* What is the easiest way to separate them?

```conllu
# sent_id = question:world:51-forces:t4:2
# text = What is the easiest way to separate them?
1	What	what	PRON	WP	PronType=Int	0	root	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	1	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	easiest	easy	ADJ	JJS	Degree=Sup	5	amod	_	_
5	way	way	NOUN	NN	Number=Sing	1	nsubj	_	_
6	to	to	PART	TO	_	7	mark	_	_
7	separate	separate	VERB	VB	VerbForm=Inf	5	acl	_	_
8	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	7	obj	_	SpaceAfter=No
9	?	?	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | the easiest way |  |  |  |  |  | tree rules |
| 2 | **separate** | to-infinitive | the easiest way *not said here* | nails *= nail* |  |  |  |  | vn separate-23.1-1-1 «NP V NP»: agent=Agent they=Patient |

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
Blow on it with a fan

```conllu
# sent_id = question:world:51-forces:t4:o1:1
# text = Blow on it with a fan
1	Blow	blow	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	on	on	ADP	IN	_	3	case	_	_
3	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	1	obl	_	_
4	with	with	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	fan	fan	NOUN	NN	Number=Sing	1	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **blow** | imperative | you *not said here* |  |  | it |  | with a fan | vn weather-57 «It V PP.theme»: with fan=Theme |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Pull the nails out with a magnet

```conllu
# sent_id = question:world:51-forces:t4:o2:1
# text = Pull the nails out with a magnet
1	Pull	pull	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	nails	nail	NOUN	NNS	Number=Plur	1	obj	_	_
4	out	out	ADV	RB	_	1	advmod	_	_
5	with	with	ADP	IN	_	7	case	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	magnet	magnet	NOUN	NN	Number=Sing	1	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pull out** | imperative | you *not said here* | the nails |  |  |  | with a magnet; out *property* | tree rules |

### Option 3 {#o3}

<!-- .ven lang=en -->
Shake the mixture in a jar

```conllu
# sent_id = question:world:51-forces:t4:o3:1
# text = Shake the mixture in a jar
1	Shake	shake	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	mixture	mixture	NOUN	NN	Number=Sing	1	obj	_	_
4	in	in	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	jar	jar	NOUN	NN	Number=Sing	1	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **shake** | imperative | you *not said here* | the mixture |  | a jar |  |  | vn funnel-9.3-1-1 «NP V NP PP.trajectory»: agent=Agent mixture=Theme in jar=Trajectory |

### Option 4 · ← Mova's choice {#o4}

<!-- .ven lang=en -->
Pour water over the mixture

```conllu
# sent_id = question:world:51-forces:t4:o4:1
# text = Pour water over the mixture
1	Pour	pour	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	water	water	NOUN	NN	Number=Sing	1	obj	_	_
3	over	over	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	mixture	mixture	NOUN	NN	Number=Sing	1	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pour** | imperative | you *not said here* | water |  | the mixture |  |  | vn preparing-26.3-2 «NP V NP»: agent=Agent water=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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- ← previous: [Forces — pushes, pulls, friction and m…, test 3](https://md.mova.elamur.ai/free/en/corpora/questions/world/51-forces/t3/)
- next →: [Forces — pushes, pulls, friction and m…, test 5](https://md.mova.elamur.ai/free/en/corpora/questions/world/51-forces/t5/)
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