过完和现完时态怎么区分?

在一个明确的过去时间之前完成,并对当时长生影响,用过去完成时态.例如
i had finished my work when you came into the room.
he had went to sleep when you came back.
i had worked hard before i gratulated.
i had learned english for 30 years by the end of last year.
动作在过去发生,在说话时刻刚刚结束,并对说话时刻产生影响,用现在完成时态.时间多为

与现在有关的模糊过去点already yet ever just before recently lately

频度once twice three times some times many times time and time again

与过去有关的现在点时间now today tonight this morning this afternoon this evening this week this month this year

for+段时间 主句动词必具备延续性

all+段时间 主句动词必具备延续性

since+点时间 表示段时间 主句动词必具备延续性

so far until now up to now in the past/last 10 years  主句动词必具备延续性