### Теория:

When and how to use FOR and SINCE in Present Perfect sentence:
FOR describes the duration of an action

FOR + A period of time
• for 5 minutes
• for 8 hours
• for 2 days
• for 4 weeks
• for 6 months
• for 3 years
• for a long time
• for ages
Example:
He has studied in Bangalore for 3 years.
He has lived here for 20 years.
They have been at the hotel for two weeks.
SINCE tells us when an action started

SINCE + A point in time
• since 8 o'clock
• since Monday
• since last week
• since August
• since 2014
• since I was 7 years old
Example:
It has rained since 9am.
We have learnt English here since 2010.
He has lived here since 2012
Ram has worked here since 2007.