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a) with stative verbs (i.e. those not normally used in the continuous form):
He has loved her ever since they were at school together.
b) with non-terminative verbs:
They have worked in the same factory since 1990. [the Present Perfect Continuous is also possible here]
c) in negative sentences:
He hasn’t shaved for days.
2) a completed action (strictly speaking, a past action) with relevance for the present. This use can be called the Present Perfect Exclusive.
I’ve made an appointment with the dentist (àtherefore, I feel rather jittery; I won’t be able to join you tomorrow; you don’t have to remind me to do so any more, etc.).
She has enrolled for this course (à therefore, she attends lectures every Monday; she is eligible for a particular grant, etc.).
It is often found with ever, never, lately, recently, of late, in recent years, over the last few years, just, yet, and already.
NOTES.
a) In American English, the Present Perfect Exclusive is often replaced with the Past Indefinite: I found a reference to this subject; It was recently announced that... I never really enjoyed skiing.
b) Note the difference between just (which goes with the Present Perfect, at least in BrE, and just now, which goes with the Past Indefinite):
They’ve just handed out the forms.
They handed out the forms just now.
c) When used in questions, already means ‘sooner than the speaker expected’; questions with already are in fact rhetorical: What? Have you done it already? You’re a fast worker, aren’t you? In neutral questions, only yet is used.
3) a future action (in clauses of time, to emphasize completion; mostly with non-terminative verbs)
When you’ve stayed here long enough, you will pick up the local dialect.
She’ll be able to play any tune by ear when/after she has heard it twice.
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