Prepositions and Time Expressions

Front

at

Back

Used to indicate a specific time or place.

Front

on

Back

Used to indicate a day or date.

Front

in

Back

Used to indicate a month, year, or long period.

Front

by

Back

Used to indicate a deadline or the latest time.

Front

since

Back

Used to indicate a starting point in time.

Front

for

Back

Used to indicate a duration of time.

Front

ago

Back

Used to indicate a time before the present.

Front

during

Back

Used to indicate a period of time in which something happens.

Front

until

Back

Used to indicate a point in time up to which something happens.

Front

before

Back

Used to indicate a time earlier than a specific point.