Identify the case of using this tense:
We visited our grandparents a few weeks ago.
an action which happened at a definite time in the past; the time is stated, already known or implied
They have been friends for twenty years.
an action which started in the past and continues up to the present, especially with state verbs and expressions "for" or "since"
They finished their homework, and then they played some video games.
actions which happened immediately one after the other in the past
The scientists have carried out some crucial experiments this week.
an action which has happened within a specific time period which is not over at the moment of speaking
Look! Grandma has picked a lot of apples!
an action which has recently finished and whose result is visible in the present
George Washington became the first president of the USA.
people who are no longer alive
Diana has watched this film. Let's choose something else.
an action which happened at an unstated time in the past; the exact time is not important, so it is not mentioned; the emphasis is on the action / EXPERIENCE
I often used to get lost in big cities, but now I feel quite at home.
past habits or states which are now finished
I often listened to my grandfather's stories about his adventures in Africa.
past habits or states which are now finished
Peter has been to Paris four times.
an action which happened at an unstated time in the past; the exact time is not important, so it is not mentioned; the emphasis is on the action / EXPERIENCE
Robert Burns wrote a great number of poems about Scotland.
people who are no longer alive
I haven't seen him since our last visit to the theatre.
an action which started in the past and continues up to the present, especially with state verbs and expressions "for" or "since"
She has drunk five cups of coffee today.
an action which has happened within a specific time period which is not over at the moment of speaking
She put on her coat and left the office immediately.
actions which happened immediately one after the other in the past
Mum, I've eaten up the soup. Can I go out with Mike?
an action which has recently finished and whose result is visible in the present
Brian won the boxing competition last summer.
an action which happened at a definite time in the past; the time is stated, already known or implied