Prepositions of TIME:
Usage: For and Since:
These prepositions explain how long an event, activity, situation has continued:
e.g. for three days
since last Thursday
Structure: Since:
Use since + (a specific time)
like March 31, or 9:19 a.m., or Tuesday.
For example:
1.2002 - They have been filming that movie since 2002
2.yesterday - I haven't had anything to eat since yesterday.
Structure: For:
After "for", we use
a period of time.
Use for + (a length of time)
like 1 day, or 3 hours, or 5 years.
For example:
1. 10 minutes - I've been waiting for
the bus for 10 minutes.
2. one whole day - Those teenagers have been singing at a karaoke for one whole day.
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