--- title: Birthdays, ages and "how many sleeps" — a lesson of Mova's school · trees and pragmatics description: «Birthdays, ages and "how many sleeps"», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: On 18 December, Christmas on the 25th is 25 − 18 = 7 sleeps away. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/) [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/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Birthdays, ages and "how many sleeps" # Birthdays, ages and "how many sleeps" Lesson 114 of the world course of Mova's primary school: 20 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). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/114-birthdays-ages-and-how-many-sleeps/). - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/1/) — On 18 December, Christmas on the 25th is 25 − 18 = 7 sleeps away. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/2/) — In the same month, just take the smaller date from the bigger one. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/3/) — Across two months, count to the end of the first month, then add on. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/4/) — From 20 November: November has 30 days, so 10 sleeps take you to 30 November, and 25 more to Christmas: 10 + 25 = 35 sleeps. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/5/) — You must know how long the month is: from 28 March to 3 April is 3 sleeps to 31 March (March has 31 days) and 3 more, 6 in all. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/7/) — This year minus your birth year gives the age you reach on this year's birthday: Charlie, born in December 2016, is 2026 − 2016 = 10 only after his December birthday; before that he is still 9. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/8/) — Turn it round to find a birth year: Grandma turning 80 in 2026 was born in 2026 − 80 = 1946. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/9/) — An age gap never changes, because both people get older at the same speed. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/10/) — Ruby is 9 and her brother is 6, a gap of 3 years, so when Ruby is 20 he will be 17, not 10. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/11/) — Age is also a rule people agree on. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/14/) — For two dates in the same month, take the smaller date from the bigger: from 18 to 25 December is 7 sleeps. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/15/) — From 20 November to 25 December is 35 sleeps: 10 to the end of November, which has 30 days, and 25 in December. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/16/) — From 28 March to 3 April is 6 sleeps: 3 to the end of March, which has 31 days, and 3 in April. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/17/) — An age gap between two people never changes: if Ruby is 9 and her brother 6, the gap is always 3 years. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/18/) — This year minus your birth year gives your age after this year's birthday; before your birthday you are one year younger. - [19](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/19/) — To find a birth year, take the age from the year of that birthday: 2026 − 80 = 1946. - [20](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/20/) — Your birthday is the date you were born, coming round again each year: Tia, born on 12 September 2016, turned 10 on 12 September 2026. - [22](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/22/) — A half-birthday is 6 months after your birthday, because a year has 12 months: 10 January plus 6 months is 10 July. - [23](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/23/) — 10 years is about 3,650 days, plus 2 or 3 extra leap days, so about 3,652 or 3,653 days. - [24](https://md.mova.elamur.ai/free/en/corpora/school/world/114-birthdays-ages-and-how-many-sleeps/24/) — Some people celebrate their 10,000th day of life, which comes when they are a little over 27 years old. - ← previous: [Seasons, terms and holidays](https://md.mova.elamur.ai/free/en/corpora/school/world/113-seasons-terms-and-holidays/) - next →: [What day of the week will it be?](https://md.mova.elamur.ai/free/en/corpora/school/world/115-what-day-of-the-week-will-it-be/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)