Past perfect

(1) Dudamel has loved music since child hood

By 1986 Dudamel had begun violin lessons
By 2020 , Kato had been conducting an orcestra  for 12 years (

use

(1)  Present perfect ( Dudamel has loved music since childhood )
He still love music until now since from childhood
By 1986 , Dudamel had begun violin lessons (Past perfect ) '( verb form is past participle form)
the different is there have a time line 1986

what is the different from past perfect and present perfect ( there have two action )
what is the key word
what is the key phrase ( ans: by this time )
in the past is not connected to noun
by phrase


native speaker do not use past perfect they normally use simple past

past perfect is better choice here
third sentence


By 2010 kato had been conducting an orchestra for 12 years ( Past perfect progressive )
( Past perfect and past perfect progessive what are the differences


past perfect and past perfect progressive different meaning

may be it still continue


verb phrase


helping verb ( auxiliary) + Past participle form  ( if verb is irregular it will be total completely different)

He had conducted one time when he left for Germany ( past perfect )
He conducted one time then he left to Germany ( he did not do in future )
two event ther have two action
what tense do we use for the first event
 what do want use for the second event ( past simple )
the two event are connected
past perfect + past simple connected

Jason had already seen him conduct  ( rephrase ) but the meaning is the same
Jason had seen him conduct already we cannot put the verb between the verb phrase and the object
that is between the verb phrase and the object

Past perfect progressive