F2. We often use the Present Perfect with time adverbials which refer to the recent past (just, only just, recently, already, yet) (e.g. Scientists have recently discovered a new breed of monkey.) or adverbials which include the present (ever (in questions); so far; until now; up to now; yet (in questions and negatives)) (e.g. Have you ever seen a ghost?)
a. Just = a short time ago (e.g. Hello. Have you just arrived?)
b. use already to say that something happened sooner than expected (e.g. Don't forget to send the letter. I've already sent it.)
c. Yet = until now. Yet shows that the speaker is expecting something to happen. only in questions and negative sentences. (e.g. Has it stopped raining yet?)
F3. use the Present Perfect with today/ this evening/ this year/ recently/ in the last few days/ so far/ since breakfast etc. (e.g. I've drunk four cups of coffee today. Have you heard from Bob recently? It's good to see you again. We haven't seen each other for a long time.)
F4. We do not use the Present Perfect with an adverbial which refers to past time which is finished. (e.g. I have seen that film yesterday.) But we can use it to refer to a time which is not yet finished. (e.g. Have you seen Helen today?)
a. Jim is on holiday. He has gone to Italy. (= he is there now or on his way there)
b. Jane is back home now. She has been to Italy. (= she has now come back)
Idiom 365
Curiosity killed the Cat: to warn someone not to ask too many questions about something
Example: What, courage man! what though care killed a cat, thou hast mettle enough in thee to kill care. (Shakespeare)