We use just for actions that happened a very short time ago.
We also use the present perfect simple with the words already and yet.
To talk about past experiences when we don’t say when something happened.
We often use the words never, ever, or before to talk about experiences.
To talk about how much of something we have done or how many times we have done something (none, one, two, three, etc.) up to now.
We can use the present perfect simple with the superlative and ever.
We use the present perfect simple with stative verbs, like be, know, have, etc., to talk about situations that started in the past and still continue. We normally use expressions like how long, for, since, lately, all day, etc.
We use the present perfect continuous with dynamic verbs to talk about situations that started in the past and still continue or have just finished, and often have present results.
To express duration, we often use words like how long, for, since, lately, all day, etc.
We can use the present perfect continuous for either continuous or repeated actions from the past till now.
We can use either the present perfect simple or continuous for situations that started in the past and still continue. But we must use the present perfect simple with stative verbs, and we normally use the present perfect continuous with dynamic verbs (although the present perfect simple is also possible.)
We use the present perfect continuous with dynamic verbs to describe situations that started in the past and still continue when we want to emphasise how long the situation has lasted.
We use the present perfect simple to talk about finished actions in the past and the present perfect continuous to describe situations (happening from the past till now) that may or may not have finished.
We can use both present perfect simple or continuous for recent actions with a present result, but we use the present perfect simple when the present results come from having finished the action, and we use the present perfect continuous when the present results come from the process of performing the action (which may or may not have finished).
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