---
title: Exam 1: two exchanges — a lesson of Mova's school · trees and pragmatics
description: «Exam 1: two exchanges», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: If A then has 3 times as many as B, the gap is 2 of B's units: one unit is 24 ÷ 2 = 12.
---

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# Exam 1: two exchanges

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Lesson 198 of the lessons course of Mova's primary school: 3 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0).

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- [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/198-two-exchanges/2/) — If A then has 3 times as many as B, the gap is 2 of B's units: one unit is 24 ÷ 2 = 12.
- [3](https://md.mova.elamur.ai/free/en/corpora/school/lessons/198-two-exchanges/3/) — So after giving, B has 12; before, B had 12 + 6 = 18, and A had 18 + 12 = 30.
- [4](https://md.mova.elamur.ai/free/en/corpora/school/lessons/198-two-exchanges/4/) — Check: 24 and 24; 36 and 12.

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