Present Perfect

Образование:
Have/has + Ved (V3)

Случаи употребления:
1) Законченное действие, связанное с настоящим через результат, опыт или приобретённые знания.
He has written a book.
I have been to the USA.
He has read this book.

2) действие, начавшееся в прошлом и продолжающееся до сих пор, особенно с глаголами состояния (be, have, like, know, love, hate, feel):
I have known her for eight years.
She has loved him since childhood.
How long have you been in Moscow?

3) совершившееся действие в период времени, который ещё не закончился (today, this morning, this week, this month, this year, this winter:
I have seen him this week.
I have been busy this afternoon.

Указатели времени, употребляемые с Present Perfect:
- already (уже)
I have already been to the gym.
- yet (ещё не, уже в вопросах и отрицаниях)
Have you joined the drama club yet?
Steven hasn’t come home yet.
- just (только что)
I have just finished my homework.