Present Perfect with For and Since

Grandma and Grandad have been married ... forty years.

• for
  

• since
  

Alison has been in the volleyball team ... two months.

• since

• for

I've had my cat ... August.

• since

• for

I know Sarah very well. She has lived next door ... 2007

• sins

• since

• for

I haven't eaten ... this morning.

• for

• since

My parents have been on holiday ... three weeks.

• for

• since

That dog hasn't stopped barking ... 7:00

• since

• for

I have known her ... three months.

• since

• for

I have lived here ... 2007.

• for

• since

Why is 'for' important in expressing actions that started in the past and continue in the present?

• It signifies the completion of the action.

• It indicates the duration or period of time the action has been ongoing.

• It emphasizes the future aspect of the action.

• It indicates the action has no relevance to the present.