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Time: In, On, AtA1

At goes with clock times, on with days and dates, and in with months, years and seasons. The period gets longer from at to on to in, and next, last, this and every take no preposition: at 7 o'clock, on Monday, in July, next Friday.

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No information at the current level. This view starts at A1: choose A1 or a higher level.

CheatsheetA1

PointRuleExample
atclock times, night, midday, Christmas, Easterat 9:30 / at night
ondays, dates and a day with its part of the dayon Monday morning / on 5 May
inmonths, seasons, years, morning, afternoon, eveningin January / in summer
Lengththe period gets longer from at to on to inat 7 o'clock / on Monday / in July
No prepositionbefore this, next, last, every, today, tomorrowI'm busy this week. / I walk every morning.
Trapdates take on, months take inMy birthday is on 5 May. / It's cold in January.
Trapthe weekend takes atWe relax at the weekend. (US: on the weekend)

OverviewA1

  • The period gets longer from at, to on, to in.

UseA1

UseExample
at + clock timeThe class starts at 9:30.
at + night, midday, midnightI sleep badly at night.
at + the weekendWe relax at the weekend. (US: on the weekend)
at + Christmas, EasterWe visit my gran at Christmas.
on + dayI work on Mondays.
on + day + part of the daySee you on Monday morning.
on + dateMy birthday is on 5 May.
on + a special dayWe have a party on New Year's Day.
in + morning, afternoon, eveningI study in the evening.
in + monthIt's cold in January.
in + seasonWe go to the beach in summer.
in + yearShe was born in 1998.

No prepositionA1

WordExample
this + morning, week, yearI'm busy this week.
next / last + day, week, monthWe meet next Monday. / He called last night.
every + day, week, yearI walk every morning.
today, tonight, tomorrow, yesterdayCall me tomorrow morning.
  • Before this, next, last, every, today and tomorrow, the time word stands alone.

Typical errorsA1

✗✓Rule
The film starts on 8 o'clock.The film starts at 8 o'clock.clock times → at
My birthday is in 5 May.My birthday is on 5 May.dates → on
We relax in the weekend.We relax at the weekend.at the weekend (US: on the weekend)
It's cold on January.It's cold in January.months → in