---
title: Platinum is rarer than gold and is used in car parts called catalyti… — Gemstones and precious metals · tree and pragmatics
description: Platinum is rarer than gold and is used in car parts called catalytic converters that clean exhaust fumes. Who acts: Platinum, car parts, catalytic converters. A sentence of the lesson «Gemstones and precious metals» of the geography course of Mova's primary school with its dependency tree and the p
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/geography/51-gemstones-and-precious-metals/18/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Geography](https://md.mova.elamur.ai/free/en/corpora/school/geography/) / [Gemstones and precious metals](https://md.mova.elamur.ai/free/en/corpora/school/geography/51-gemstones-and-precious-metals/) / 18

# Gemstones and precious metals, sentence 18

<!-- .ven lang=en -->
Platinum is rarer than gold and is used in car parts called catalytic converters that clean exhaust fumes.

<!-- .vintro -->
**Who acts:** Platinum, car parts, catalytic converters · **What happens:** be, use, call, clean · **To what, where:** car parts, catalytic converters, exhaust fumes · **Speech:** someone speaks here

<!-- .vabout -->
This is a sentence of the lesson «Gemstones and precious metals» of the geography course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Platinum, car parts, catalytic converters), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:geography:051-gemstones-and-precious-metals.lesson:18
# text = Platinum is rarer than gold and is used in car parts called catalytic converters that clean exhaust fumes.
# source = school lesson (ours)
# course = geography
# lesson = 051-gemstones-and-precious-metals.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	Platinum	platinum	NOUN	NN	Number=Sing	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	rarer	rare	ADJ	JJR	Degree=Cmp	0	root	_	_
4	than	than	ADP	IN	_	5	case	_	_
5	gold	gold	NOUN	NN	Number=Sing	3	obl	_	_
6	and	and	CCONJ	CC	_	8	cc	_	_
7	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	aux:pass	_	_
8	used	use	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	conj	_	_
9	in	in	ADP	IN	_	11	case	_	_
10	car	car	NOUN	NN	Number=Sing	11	compound	_	_
11	parts	part	NOUN	NNS	Number=Plur	8	obl	_	_
12	called	call	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	11	acl	_	_
13	catalytic	catalytic	ADJ	JJ	Degree=Pos	14	amod	_	_
14	converters	converter	NOUN	NNS	Number=Plur	12	obj	_	_
15	that	that	PRON	WDT	PronType=Rel	16	nsubj	_	_
16	clean	clean	VERB	VBP	Mood=Ind|Tense=Pres|VerbForm=Fin	14	acl:relcl	_	_
17	exhaust	exhaust	NOUN	NN	Number=Sing	18	compound	_	_
18	fumes	fume	NOUN	NNS	Number=Plur	16	obj	_	_
19	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- sa -->
- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Platinum |  |  |  |  | than gold; rare *property* | tree rules |
| 2 | **use** | present · passive | Platinum *not said here* |  |  | car parts |  |  | vn eat-39.1 «NP V» |
| 3 | **call** | participle | car parts *not said here* | catalytic converters |  |  |  |  | vn initiate\_communication-37.4.2-1 «NP V NP.recipient»: agent=Agent converter=Recipient |
| 4 | **clean** | present | catalytic converters | exhaust fumes |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent fume=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.

<!-- div src -->

**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:geography:051-gemstones-and-precious-metals.lesson:18`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

<!-- /div -->

<!-- pn -->
- ← previous: [Gemstones and precious metals, 17](https://md.mova.elamur.ai/free/en/corpora/school/geography/51-gemstones-and-precious-metals/17/)
- next →: [Gemstones and precious metals, 19](https://md.mova.elamur.ai/free/en/corpora/school/geography/51-gemstones-and-precious-metals/19/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/geography/51-gemstones-and-precious-metals/)