present perfect vs past simple

Grammar

Present perfectpast simple

What are we going to see?

Uses and form

Past simple or present perfect

Present perfect

I have just texted you.

Use and form

have/has + past participle have/has + just/already + pp yet: at the end of (-) and (?)

past experiences

I have travelled in Business.I have been to London but haven't been to Oxford Have you ever lost your credit card? She has never met her nephew in person

ever/never ask about experiences before the main verb

recent past actions

I have just texted you I've cut my finger Too late? Our train has just left?

with yet and already (for emphasis)

I have already seen this film twice. Can we watch another? My brother hasn't found a new job yeat. He is still looking. -Have you finished your homework yet? - No, not yet.

Present perfect or past simple?

VERSUS

Present Perfect

Past Simple

To ask and talk about finished actions in the past when the time is mentioned or it is understood We often use a past time expression: yesterday, last week, etc. I've bought a new computer. (=the date or time is not mentioned) I bought a computer last Friday (= I say when)

When we talk about a past experience or recent past actions and when we don't specify WHEN EXACTLY this happened. I've been to Madrid twice. (=in my life until now) I went to Madrid in 2009 and 2015 (= on two specific occassions)

thanks