Eduqo
English Grammar›Ch 3: Parts of Speech›Prepositions of Time: AT, ON, IN, SINCE, FOR
Clock time takes AT, a day or date takes ON, a long period takes IN.
Go from small to large: AT for an exact clock time, ON for one day or date, IN for a month, season, year or century.
Quick Memory
| Word | Use for | Example |
|---|---|---|
| AT | Clock time, night, noon | Exam starts at 10 am. |
| ON | Day, date, festival | Result comes on Friday. |
| IN | Month, season, year | He joined in 2021. |
| SINCE | Point of time | Working since March. |
| FOR | Length of time | Working for 3 hours. |
at
(exact time)
at 5 pm
on
(one day)
on Monday
in
(long period)
in June
by
(deadline)
by 6 pm
since 2 hoursfor 2 hours
SINCE needs a point, not a length.
in nightat night
Night takes AT; morning takes IN.
on 2021in 2021
Years always take IN.
Q1.She has been preparing ____ 2022.
Q2.The paper will be held ____ 12 October.