Sounds right, but is wrong

Tests: 3 of 12 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 5 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 183 of the world course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · ★★ · wrong ✗

Freddie's sister: "Check it, bro, your answer's 10p too expensive." A pencil and a rubber cost £1.20 together, and the pencil costs £1 more than the rubber. How much is the rubber?

1. 5p — ← Mova's choice · score 11
2. £1 — no support
3. 20p — score 11
4. 10p — ✓ the right answer · score 11

Why: It took the question to ask what it is done to. It chose option 1 with score 11, tied with another option at 11 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 183, line 1: «These answers jump out at you, sound perfect, and are wrong. A bat and a ball cost £1.10 and the bat costs £1 more: "The ball is 10p!" says everyone. Check it:…», reached through the same lesson line as the sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+4); it fills the role the question asks for (+4); the same thing acted on «10 p» (+3). The right option, 4, scored 11. · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · wrong ✗

Ruby: "Day 24, easy!" Teacher: "On day 24 it was tiny, like a freckle." If a doubling pond fills on day 30, when was it a quarter full?

1. Day 15 — ← Mova's choice · no support
2. Day 7 — no support
3. Day 28 — ✓ the right answer · no support
4. Day 29 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · wrong ✗

Toby: "100 minutes, fam!" If 3 bakers each bake one cake in 3 hours, how long do 6 bakers take to bake 6 cakes, one each?

1. 1 and a half hours — ← Mova's choice · no support
2. 6 hours — no support
3. 12 hours — no support
4. 3 hours — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · wrong ✗

Ava's dad: "Twelve strikes, eleven gaps, eleven seconds." A clock strikes 3 times in 2 seconds. How long does it take to strike 9 times?

1. 9 seconds — ← Mova's choice · no support
2. 6 seconds — no support
3. 8 seconds — ✓ the right answer · no support
4. 4 and a half seconds — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · wrong ✗

Mum: "One and a half? Put it back in the story, Pete. Does it fit?" A bag of flour weighs 2 kg and half a bag. How much does the whole bag weigh?

1. 2 kg — ← Mova's choice · score 6
2. 2 kg and a bit — score 6
3. 3 kg — score 6
4. 4 kg altogether — ✓ the right answer · score 6

Why: It took the question to ask what it is done to. It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 183, line 4: «Others hide a fence-post (6 strikes of a clock have only 5 gaps between them) or a whole hiding inside a part (a brick that weighs 1 kg and half a brick weighs…», reached through the remembered sentence the question matched. What matched: the same action «weigh» (+4); a different doer (counts against) (+2); it fills the role the question asks for (+1). Against it: the same thing acted on «1 kg» (-1). The right option, 4, scored 6. · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · right ✓

The shop assistant: "Up to £15, then half off, £7.50. Bargain, mate." What if the £10 toy went down by half first, then up by half?

1. £7.50 — ← Mova's choice · ✓ the right answer · no support
2. £15 — no support
3. £5 — no support
4. £10 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · wrong ✗

Max: "Heavy stuff falls faster, everyone knows." His friend: "Galileo already did this, about 400 years ago." What happens if you drop a feather and a ball in the classroom?

1. The feather lands first — score 6
2. The feather falls upwards — score 4
3. The ball lands first, because air slows the feather a lot — ✓ the right answer · score 4
4. They land at exactly the same moment — ← Mova's choice · score 8

Why: It took the question to ask what happens next. It chose option 4 with score 8, against 6 for the next best. Its support: lesson 183, line 13: «On the Moon, where there is no air, an astronaut dropped a hammer and a feather in 1971 and they landed at the same moment.», reached through what followed the sentence the question matched. What matched: the same action «land» (+4); the same doer «feathers» (+2); the same property (+2). The right option, 3, scored 4. · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

Mia's brother: "Definitely, she said. Rolled six times, no six." What is the real lesson?

1. The dice must be broken — ← Mova's choice · no support
2. Mia should have rolled faster — no support
3. A six must come by the sixth roll — no support
4. 1 in 6 is a chance each roll, not a promise in 6 rolls — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · wrong ✗

Jamal's mum: "You don't get extra birthdays for being the oldest, love." When Jamal is 30, how old will his brother be?

1. 15 — ← Mova's choice · no support
2. 35 — no support
3. 20 — no support
4. 25 — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · right ✓

Ellie: "My hand hurts, this party is a handshake factory." How many handshakes are there with 5 kids, each shaking every other hand once?

1. 10 — ← Mova's choice · ✓ the right answer · no support
2. 20 — no support
3. 8 — no support
4. 6 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · wrong ✗

A cousin in Singapore: "Ball costs 10 cents lah, can or not?" A bat and ball cost $1.10 and the bat costs $1 more. What is the answer?

1. Can; the bat costs exactly $1 — score 5
2. Can; the ball costs 10 cents — ← Mova's choice · score 6
3. Cannot; the ball costs 5 cents — ✓ the right answer · score 4
4. Cannot; the ball costs 1 cent — score 4

Why: It took the question to ask what it is done to. It chose option 2 with score 6, against 5 for the next best. Its support: lesson 183, line 6: «If a bat and a ball cost £1.10 together and the bat costs £1 more than the ball, the ball costs 5p and the bat £1.05.», reached through the remembered sentence the question matched. What matched: the same action «cost» (+4); the same doer «ball» (+1); a different thing acted on (counts against) (+1). The right option, 3, scored 4. · the question and its options parsed, with trees and pragmatics

Test 12 · ★★ · right ✓

In a cartoon a dragon's gold pile doubles every day and fills the cave on day 100. The dragon says, "So it was half full on day 50!" Put the cartoon right.

1. It was half full on day 99 — ← Mova's choice · ✓ the right answer · no support
2. It was half full on day 75 — no support
3. It was half full on day 50 — no support
4. It was half full on day 98 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

It is given that a bat and a ball together cost one pound and ten pence and that the bat costs one pound more than the ball. Ascertain the price of the ball.

1. Five pence — ← Mova's choice · ✓ the right answer · no support
2. Fifty-five pence — no support
3. One pound — no support
4. Ten pence — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

A clock strikes six times in five seconds, the interval between successive strikes being constant. Determine the time required for twelve strikes.

1. Six seconds — ← Mova's choice · no support
2. Eleven seconds — ✓ the right answer · no support
3. Twelve seconds — no support
4. Ten seconds — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

An article priced at ten pounds is increased in price by one half and is subsequently reduced by one half. Compute the final price.

1. Twelve pounds and fifty pence — ← Mova's choice · no support
2. Five pounds — no support
3. Ten pounds — no support
4. Seven pounds and fifty pence — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Select the response that is consistent with the established facts concerning a hammer and a feather released simultaneously upon the surface of the Moon.

1. The hammer reaches the surface first — ← Mova's choice · score 4
2. The feather reaches the surface first — score 4
3. The feather does not descend at all — score 3
4. Both reach the surface at the same moment — ✓ the right answer · score 4

Why: It took the question to ask which statement is true. It chose option 1 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 54, line 5: «When sound hits a large hard surface, such as a cliff or a wall of an empty hall, it bounces back. The sound we hear coming back is called an echo.», reached through the option's own match among the sentences about the question's things. What matched: the same action «hit» (+4). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

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