---
title: Oil and grease reduce friction between moving parts. — Pushes, pulls, friction and wheels · tree and pragmatics
description: Oil and grease reduce friction between moving parts. Who acts: Oil. A sentence of the lesson «Pushes, pulls, friction and wheels» of the world course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Pushes, pulls, friction and wheels, sentence 20

<!-- .ven lang=en -->
Oil and grease reduce friction between moving parts.

<!-- .vintro -->
**Who acts:** Oil · **What happens:** reduce, move · **To what, where:** friction

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This is a sentence of the lesson «Pushes, pulls, friction and wheels» of the world 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 (Oil), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:085-pushes-pulls-friction-wheels.lesson:20
# text = Oil and grease reduce friction between moving parts.
# source = school lesson (ours)
# course = world
# lesson = 085-pushes-pulls-friction-wheels.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): R8-pos-agree ×1
1	Oil	oil	NOUN	NN	Number=Sing	4	nsubj	_	_
2	and	and	CCONJ	CC	_	3	cc	_	_
3	grease	grease	NOUN	NN	Number=Sing	1	conj	_	_
4	reduce	reduce	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	Agree=R8-pos-agree|Haiku=0:root|HaikuPos=VERB:VB:VerbForm=Inf
5	friction	friction	NOUN	NN	Number=Sing	4	obj	_	_
6	between	between	ADP	IN	_	8	case	_	_
7	moving	move	VERB	VBG	VerbForm=Ger	8	amod	_	_
8	parts	part	NOUN	NNS	Number=Plur	5	nmod	_	_
9	.	.	PUNCT	.	_	4	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 | **reduce** | present | Oil and grease | friction |  |  |  | between moving parts | vn limit-76 «NP V NP»: agent=Causer friction=Patient |
| 2 | **move** | gerund |  |  |  |  |  |  | vn roll-51.3.1 «NP.theme V»: agent=Theme |

<!-- .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.

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**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:world:085-pushes-pulls-friction-wheels.lesson:20`.

**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): R8-pos-agree ×1. **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/).

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- ← previous: [Pushes, pulls, friction and wheels, 19](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/19/)
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