Virtuous English AcademyNumbers & Time — A1 English Vocabulary
This A1 vocabulary list gathers 20 beginner English words about numbers & time — counting, days, months and telling the time. Every word comes with a simple definition, its British-English pronunciation and a natural example sentence, so you learn each one in real context. When you are ready, open the flashcards to practise and remember them for good.
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Using numbers & time words in English
Everything on this list is needed within your first week of speaking English — for appointments, timetables, prices and simply arranging to meet someone. It is also the topic that produces the highest number of small errors, because English uses three different prepositions for time and chooses between them by the size of the unit, not by meaning.
What to watch out for
at a time, on a day, in a month
The smallest unit takes at: at six o’clock, at midnight. Days and dates take on: on Monday, on 3 June. Months, seasons and years take in: in July, in winter, in 2026. Learn the three as one rule and most time errors disappear at once.
Days and months take a capital letter
Monday, Tuesday, June, December — always capitals, wherever they appear in the sentence. Many languages write them in lower case, so this is a very common slip in writing. Seasons, though, do not: summer and winter stay lower case.
Two ways to tell the time, and both are used
The traditional way builds from the hour: half past seven, quarter to eight, ten past three. The digital way just reads the numbers: seven thirty, seven forty-five. Both are current. O’clock belongs only to the exact hour — six o’clock, never six thirty o’clock.
Words learners mix up
Two tables. The first is about numbers that refuse to take a plural -s where you expect one. The second is about the three words you need for saying how long something lasts.
Numbers that stay singular
| Word | What it actually means | In a sentence |
|---|---|---|
| hundred | After a number it never takes -s: two hundred people. It only becomes hundreds when of follows and the amount is vague. | There were two hundred people. |
| one | The number, and also a word that replaces a noun so you do not repeat it. | I want the red one. |
| ten | An ordinary number. For dates and floors it changes shape: the tenth of June, the tenth floor. | I have ten minutes. |
The rule that catches everybody is the first one. Exact amounts keep the singular — three hundred, five thousand — and only the vague version adds -s and needs of: hundreds of cars. The two forms never mix, so two hundreds of people is wrong twice over.
Saying how long it takes
| Word | What it actually means | In a sentence |
|---|---|---|
| hour | Sixty minutes. The h is silent, so it takes an, not a: an hour. | The lesson lasts an hour. |
| minute | Sixty seconds. In speech a minute usually means a short while rather than exactly sixty seconds. | Wait a minute, please. |
| day | Twenty-four hours, or the light part of one. One day also means at some point in the future. | I work eight hours a day. |
When a length of time comes in front of a noun it loses its plural and takes a hyphen: a two-hour lesson, a ten-minute walk, a three-day holiday. Say it the other way round and the plural comes back: the lesson lasts two hours. Both are right, and only the order decides which you need.
Collocations that sound natural
Four words and the phrases built on them. Almost everything you say about arranging to meet someone is in here.
time
What time is it?have timeon timea long timethe first time
On time means at the arranged moment; in time means early enough. A train is on time, and you get to the station in time to catch it.
week
last weeknext weekthis weekonce a weeka week ago
These take no preposition at all: I saw her last week, never in last week. The little word only appears with in a week, which means a week from now.
night
last nightat nightall nightGood night!tomorrow night
Good night is a goodbye, not a greeting. If you say it when you arrive, English speakers will think you are leaving again straight away.
Monday
on Mondayevery Mondaylast MondayMonday morning
Days take on and never the. Add a part of the day and the preposition still holds: on Monday morning.
Where each word belongs
Five words that need placing. Two are British habits, one is a greeting in disguise, and one belongs to writing far more than to speech.
- weekendBritish · prepositionBritain says at the weekend and America says on the weekend. Both are understood everywhere, and neither is a mistake.
- todayNo prepositionIt is already an adverb, so it stands alone: I am working today. Putting on or in in front of it is a common slip and always wrong.
- morningGreetingOn its own, Morning! is how British people greet each other before lunch — the good gets dropped in ordinary speech and it sounds friendlier that way.
- clockNot a watchA clock hangs on a wall or stands on a table. The one on your wrist is a watch, and the two words are never swapped.
- numberWriting · vague amountBeyond counting, a number of means several without saying how many, and it belongs to writing: a number of students were late.
Sentences to try
Four frames for times and days. Replace the details with your own schedule.
- I start work at nine o’clock.
- The lesson is on Monday morning.
- What time is it? — It is half past two.
- See you tomorrow, at the weekend.
Questions about numbers & time vocabulary
When do I use at, on and in for time?
By the size of the unit. At for clock times and points in the day: at seven, at night. On for days and dates: on Friday, on my birthday. In for longer stretches — months, seasons, years and parts of the day: in April, in the morning. The awkward pair to remember is at night against in the morning; both are fixed and simply have to be learned.
Why are Monday and June written with capital letters?
Because English capitalises days, months, nationalities and languages wherever they appear in a sentence, not only at the start. So you write I have English on Tuesday in March with three capitals. Seasons are the exception and stay lower case. If your language writes these in lower case, this is one of the easiest points to lose marks on in written work.
How do I say 7:30 in English?
Either half past seven or seven thirty. The first is the traditional form and still very common in Britain; the second reads the digits and is quicker. For times past the hour, use past up to thirty minutes — ten past seven — and to after it: twenty to eight. Note that British English says half past seven where American English often drops the past.