1. it happened earlier than other events in the past
İngilizce kelime "Past Perfect"(it happened earlier than other events in the past) kümelerde oluşur:
Love Research2. a letter had been written
İngilizce kelime "Past Perfect"(a letter had been written) kümelerde oluşur:
czasy i gramatyka3. Past Simple
4. Present Perfect
5. Past Perfect
Use regret + gerund, if only + past perfect or wish + past perfect to say we want something in the past to have been different.