GramifyLearn
BeginnerPrepositions

Learn Prepositions of Time in English

At, on, in for time expressions — days, months, years, and clock times.

Learning goal
Recognize and use this pattern in context.
Practice
10 randomized questions with explanations.
Suggested workflow
Study the examples, then take the quiz.

Grammar Focus

Prepositions of time — at, on, and in — tell us when something happens. Each preposition is used for a different type of time expression, and choosing the right one is essential for natural, accurate English.

  • Use at for specific clock times and fixed daily points: "at 7 o'clock," "at noon," "at midnight," "at night"
  • Use on for days of the week and specific dates: "on Monday," "on 15th March," "on Christmas Day," "on my birthday"
  • Use in for longer periods — months, years, seasons, and parts of the day: "in July," "in 2020," "in summer," "in the morning"
  • There is no preposition before "today," "tomorrow," "yesterday," "last week," or "next year"
  • Remember the fixed phrases: at night (not "in the night" for general meaning), in the morning / afternoon / evening" (but at night**)

Form & Structure

AT for Specific Times

at + clock time / fixed time point: at 3 o'clock, at noon, at night, at midnight, at the weekend (British English)
The meeting starts at 9 o'clock.
She always has lunch at noon.
I find it hard to sleep at night.

ON for Days and Dates

on + day of the week / specific date / named day: on Monday, on 4th July, on New Year's Day, on my anniversary
We have English class on Tuesday.
Her birthday is on the 12th of August.
The office is closed on Christmas Day.

IN for Longer Periods

in + month / year / decade / century / season / part of the day: in March, in 1999, in the 1980s, in winter, in the morning
My parents got married in June.
She was born in 1995.
I prefer to exercise in the morning.

Common Mistakes

Using 'in' instead of 'at' for clock times

The train leaves in 6 o'clock.
The train leaves at 6 o'clock.

Tip: Always use 'at' with specific clock times — at 6 o'clock, at 9:30, at midday. 'In' is for longer periods like months and years.

Using 'in' instead of 'on' for days of the week

I go swimming in Monday.
I go swimming on Monday.

Tip: Use 'on' with days of the week (on Monday, on Friday) and specific dates (on 3rd March). Remember: days = on.

Using a preposition before 'tomorrow', 'yesterday', or 'last/next'

I will see you on tomorrow.
I will see you tomorrow.

Tip: Never use at, on, or in before tomorrow, yesterday, today, last week, next month, or next year. These words stand alone.

Why This Grammar Matters

Making and confirming appointments

“The doctor can see you on Thursday at 2:30.”
“Let's meet on Friday morning — how about at 10 o'clock?”

Talking about your daily schedule

“I start work at 8 in the morning and finish at 5 in the afternoon.”
“On Saturdays, I usually sleep in and go to the market in the afternoon.”

Sharing plans and future events

“The concert is on Saturday evening — it starts at 8 o'clock.”
“We're going on holiday in August, in the first week.”

Describing past events and telling stories

“She was born in 1988, on a cold morning in January.”
“They met at a party on New Year's Eve in 2015.”