---
title: Ascertain the principal reason for which titanium is employed in hip… — Metals and what they're good for · tree and pragmatics
description: Ascertain the principal reason for which titanium is employed in hip replacements. Exam question 4 of lesson 31 «Metals and what they're good for» 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 was right.
---

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# Exam question 4 · Metals and what they're good for

<!-- .ven lang=en -->
Ascertain the principal reason for which titanium is employed in hip replacements.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you · **What happens:** ascertain, employ · **To what, where:** principal reason, titanium, hip replacements

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This is exam question 4 of lesson 31 «Metals and what they're good for» of the chemistry course of Mova's primary school, asked in stiff, formal language. 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/31-metals-what-theyre-good-for/#e4).

## The question {#question}

```conllu
# sent_id = question:chemistry:31-metals-what-theyre-good-for:e4:1
# text = Ascertain the principal reason for which titanium is employed in hip replacements.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	9	obl	_	_
7	titanium	titanium	NOUN	NN	Number=Sing	9	nsubj:pass	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	aux:pass	_	_
9	employed	employ	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl:relcl	_	_
10	in	in	ADP	IN	_	12	case	_	_
11	hip	hip	NOUN	NN	Number=Sing	12	compound	_	_
12	replacements	replacement	NOUN	NNS	Number=Plur	9	obl	_	SpaceAfter=No
13	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the principal reason |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent reason=Topic |
| 2 | **employ** | present · passive |  | titanium |  | hip replacements |  | for the principal reason | vn use-105.1 «NP V NP PP.predicate»: subject=Theme for which=Eventuality |

<!-- .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 is the most magnetic of metals

```conllu
# sent_id = question:chemistry:31-metals-what-theyre-good-for:e4:o1:1
# text = It is the most magnetic of metals
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	5	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	most	most	ADV	RBS	Degree=Sup	5	advmod	_	_
5	magnetic	magnetic	ADJ	JJ	Degree=Pos	0	root	_	_
6	of	of	ADP	IN	_	7	case	_	_
7	metals	metal	NOUN	NNS	Number=Plur	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  |  |  | of metals; magnetic *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
It is luminous in darkness

```conllu
# sent_id = question:chemistry:31-metals-what-theyre-good-for:e4:o2:1
# text = It is luminous in darkness
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	luminous	luminous	ADJ	JJ	Degree=Pos	0	root	_	_
4	in	in	ADP	IN	_	5	case	_	_
5	darkness	darkness	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  | darkness |  | luminous *property* | tree rules |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
It is well tolerated by the human body

```conllu
# sent_id = question:chemistry:31-metals-what-theyre-good-for:e4:o3:1
# text = It is well tolerated by the human body
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
3	well	well	ADV	RB	Degree=Pos	4	advmod	_	_
4	tolerated	tolerate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	by	by	ADP	IN	_	8	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
7	human	human	ADJ	JJ	Degree=Pos	8	amod	_	_
8	body	body	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **tolerate** | present · passive | the human body | It |  |  |  | well *property* | vn admire-31.2 «NP V NP»: agent=Experiencer subject=Stimulus |

### Option 4 {#o4}

<!-- .ven lang=en -->
It is the softest of metals

```conllu
# sent_id = question:chemistry:31-metals-what-theyre-good-for:e4:o4:1
# text = It is the softest of metals
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	softest	soft	ADJ	JJS	Degree=Sup	0	root	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	metals	metal	NOUN	NNS	Number=Plur	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  |  |  | of metals; soft *property* | tree rules |

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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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