Study

for / since

0%

0 0 0

Friday

SINCE Friday

2010

SINCE 2010

2018

SINCE 2018

three weeks

FOR three weeks

2 o'clock

SINCE 2 o'clock

millions of years

FOR millions of years

2 hours

FOR 2 hours

this morning

SINCE this morning

a long time

FOR a long time

half past three

SINCE half past three

3 minutes

FOR three minutes

2000 years

FOR 2000 years.