Past perfect- Completed in the past, before something else happened
= Had + past participle
(ed/3e rij)
- When he had finished studying, he went home
(alle twee al afgerond).
Past perfect continuous
- Completed in the past, took some time. Focus on duration.
= Had + been + present participle
(+ing)
- He had been studying English for six years, after he had finished his thesis he moved to Portugal to teach.
(wel zes jaar lang, nu niet meer).