Difference Between Present Perfect and Past Perfect in English | present perfect | ความรู้ภาษาต่างประเทศที่เป็นประโยชน์

He hadn't seen any gazelles since he was 10 years old.
He haven't seen any gazelles since he was 10 years old.

what's the difference?

Present perfect tense = an action that happened in the immediate past or an action that happened in an unspecified time
E.g
I have had my breakfast just now
I have gone to market

Past perfect tense=an action that happened before another action occurred( past of past)

I had had my breakfast by the time she showed up.( here two actions are in the past. 1) You took your breakfast 2), she showed up))

I had gone to market before I lost my key
Two actions are in the past.(1 you went to market. 2) you lost your key)

It's good l learn more things from these

thanks, but when it comes to the practical side, i get confused about present perfect and past perfect.

When I reached .my wife had writen the letter

If the subject is I, why can't we use don't for the present perfect instead of haven't for the negative????

When you don't understand this

Keine Schwäche zeigen

Before I woke up this morning, my husband had already eaten breakfast.

1.5 or 1.25 (speed)

👍👍👍

Nice explanation!