Past Perfect and Past Perfect Progressive tenses

[ifyouwannabemylover]

This is probably the only thing in English grammar that I don't yet 100 % get or at least it doesn't come intuitively to me.

The 12 Basic English Tenses | Learn English

Present Simple, Present Continuous, Present Perfect, Present Perfect Continuous; Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous; Future Simple, Future Continuous, Future Perfect, Future Perfect Continuous

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I feel like even a lot of native speakers don't understand or use them. Thoughts?

@Jamesothy

 

[Growth Plate]

Future Perfect Continuous
I will have been doing your mom