Decades, centuries and millennia

Tests: 5 of 11 right · Exam: 0 of 4 right · Kind: plain · Understood: 4 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 124 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 ✗

Ruby: "Nan was a teen in the eighties? So, like, 80 years ago?" What's right?

1. The eighties are 1880 to 1889 — ← Mova's choice · no support
2. The eighties are 1980 to 1989, about 40 years ago — ✓ the right answer · no support
3. It means when she was 80 years old — no support
4. Yes, exactly 80 years ago — no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 2 · wrong ✗

Tom: "21st century? It's 2026, not 2126, the teacher's well confused." What's true?

1. The 21st century only starts in 2100 — no support
2. Centuries are counted from the year 21 — ← Mova's choice · score 2
3. Tom's right, we're in the 20th century — no support
4. The 1st century was years 1 to 100, so the 2000s are the 21st — ✓ the right answer · score 1

Why: It took the question to ask which statement is true. It chose option 2 with score 2, against 1 for the next best. Its support: lesson 124, line 2: «Centuries are counted from year 1, so the 1st century was years 1 to 100, and the century's number is one more than its hundreds: the 1800s are roughly the 19t…», reached through the option's own match among the sentences about the question's things. What matched: the same action «count» (+1); the same property (+1). The right option, 4, scored 1. · the question and its options parsed, with trees and pragmatics

Test 3 · right ✓

Freya, from Newcastle: "A millennium's a thousand years, like. Has any bairn been alive that long?" ("Bairn" means child.) What's true?

1. No person has, but some trees are over 4,000 years old — ← Mova's choice · ✓ the right answer · no support
2. Yes, but only people in ancient times — no support
3. No living thing has lived over 200 years — no support
4. Yes, lots of people have lived 1,000 years — 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 · right ✓

Grandad at a party in 2000: "Technically we're a year early, you numpties." Why?

1. The millennium had begun back in 1999 — no support
2. Grandad was looking at the wrong calendar — no support
3. Counting started at year 1, so the millennium began in 2001 — ← Mova's choice · ✓ the right answer · score 8
4. There was no year 2000 in the calendar — score 7

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 8, against 7 for the next best. Its support: lesson 124, line 2: «Centuries are counted from year 1, so the 1st century was years 1 to 100, and the century's number is one more than its hundreds: the 1800s are roughly the 19t…», reached through the same lesson line as the sentence the question matched. What matched: the same action «begin» (+4); the same doer «new millennium» (+2); the same place «2001» (+2). · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

Kai: "100 years is ages, no one lives that long, no cap." ("No cap" means honestly.) Nan: "My nan did!" Who's right?

1. Nan: about 15,000 people in Britain are 100 or older — ← Mova's choice · ✓ the right answer · no support
2. Nan: nearly everyone lives to 100 now — no support
3. Kai: only kings and queens live to 100 — no support
4. Kai: nobody has ever lived to 100 — 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 6 · wrong ✗

Ella's family tree: her, her mum, her nan, her great-nan. About how many years might that cover?

1. About twenty years — ← Mova's choice · no support
2. About a single decade — no support
3. About a century — ✓ the right answer · no support
4. About a millennium — no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Max: "How many days in a century, roughly?" Which sum gets close?

1. 100 × 12, plus 24 — ← Mova's choice · no support
2. 100 × 365, plus about 25 leap days — ✓ the right answer · no support
3. 10 × 365 — no support
4. 100 × 52 — no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 8 · right ✓

Liam's teacher writes "19th century". His mate: "Easy, the 1900s, innit." Fix it.

1. It's the 1800s: take 1 from 19 to get the hundreds — ← Mova's choice · ✓ the right answer · no support
2. He's right, it's the 1900s — no support
3. It's the 1700s — no support
4. It's the 2000s — 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 ✗

Grace: "That song's from the noughties? It's like 20 years old, that's ancient, I'm dead." ("I'm dead" means I'm laughing so hard.) The song is from 2006. How old is it in 2026?

1. 10 years — ← Mova's choice · no support
2. 6 years — no support
3. 20 years — ✓ the right answer · no support
4. 60 years — 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 ✓

What would happen if centuries were counted from a year 0 instead of from year 1?

1. The 21st century would last a full 1,000 years — score 2
2. There would be no 21st century at all, only the 20th — score 3
3. The 21st century would run from 2000 to 2099 — ← Mova's choice · ✓ the right answer · score 4
4. The 21st century would only run from 2100 to 2199 — score 4

Why: It took the question to ask what happens next. It chose option 3 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 124, line 7: «The 1st century was years 1 to 100, so the 21st century runs from 2001 to 2100.», reached through the option's own match among the sentences about the question's things. What matched: the same action «run» (+3); the same doer «21st century» (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

Ivy: "The universe is 13.8 billion years old? How many millennia is that, then?"

1. 13.8 billion millennia — ← Mova's choice · no support
2. 13.8 thousand millennia — no support
3. 138 millennia — no support
4. 13.8 million millennia — ✓ 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 1 · formal language · wrong ✗

Determine the span of years constituting the twenty-first century.

1. From 2000 to 2099 inclusive — ← Mova's choice · no support
2. From 2100 to 2199 inclusive — no support
3. From 1901 to 2000 inclusive — no support
4. From 2001 to 2100 inclusive — ✓ 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 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the designation "the eighties", as employed in the phrase "a teenager in the eighties"?

1. The decade comprising the years 1880 to 1889 inclusive — no support
2. The century comprising the years 1800 to 1899 inclusive — ← Mova's choice · score 4
3. The decade comprising the years 1980 to 1989 inclusive — ✓ the right answer · no support
4. A period commencing eighty years before the present — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 4, the only option with support. Its support: lesson 117, line 3: «The Chinese and Jewish calendars follow both. Their months follow the Moon, but in some years they add a whole extra month, like a runner stopping to let a fri…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «chinese new year» (+2). Against it: a different action (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Ascertain the date upon which the third millennium commenced.

1. The first of January, 2000 — ← Mova's choice · no support
2. The first of January, 2001 — ✓ the right answer · no support
3. The thirty-first of December, 1999 — no support
4. The first of January, 2100 — 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 ✗

Given that a generation spans approximately twenty-five to thirty years, identify the approximate number of generations comprised in one century.

1. Forty — ← Mova's choice · no support
2. One — no support
3. Four — ✓ the right answer · no support
4. Ten — 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

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