Present perfect - uninterrupted past actions with for and since

Guatemala has been independent since ...

Computers have existed for (1945) ... years

Teachers have taught English at IGA since (78 years) ...

We have spoken Spanish in Guatemala for more than ... years

I haven't eaten breakfast since ...

• this morning

• tomorrow

• 2 hours ago

• usually

I've lived in the same house since ...

• tomorrow

• next month

• a long time

• I was a child

Miguel and I have been friends for ...

• next year

• now

• a long time

• I was a child

I've worked in this company since ...

• I graduated from school

• two years ago

• last summer

• a long time