Present perfect I have done
Ong is looking for his key.He can't find it.
'Ong has lost his key.' have/has lost = present perfect simple
I/We/They/You have done
He/she/it has been
Past perfect
For example ; Christy went to night club last night.Steve went to the night club too but they didn't see each other.Steve went home at 11.30 and Christy arrived at 12.00.
When Christy arrived at the night club,Steve wasn't there.He had gone home.
Past perfect simple = had + past participle (gone/seen/finished)
http://www.monash.edu.au/lls/llonline/grammar/tense/2.1.xml
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