Past Perfect
Past perfect is used to describe something happened in the past and already finished. It is usually used to compare 2 things in the past.
had + p.p.
ex) I had studied Korean for 2 years when I started to study English.
Present Perfect
Present perfect is used to describe something happened in the past and is still continuing until now.
have/has + p.p.
ex) I have studied English for 10 years.
Future Perfect
Future perfect is used to describe something will happen in the future and it's easy to expect to be done.
will have + p.p.
ex) I will have finished my homework by tomorrow.
Past perfect is used to describe something happened in the past and already finished. It is usually used to compare 2 things in the past.
had + p.p.
ex) I had studied Korean for 2 years when I started to study English.
Present Perfect
Present perfect is used to describe something happened in the past and is still continuing until now.
have/has + p.p.
ex) I have studied English for 10 years.
Future Perfect
Future perfect is used to describe something will happen in the future and it's easy to expect to be done.
will have + p.p.
ex) I will have finished my homework by tomorrow.
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