Когда пишется have, а когда has в present perfect passive? если i, we, she, he и тд. не написано?

Если речь об одном человеке или 1 предмете или чем-то неисчисляемом (tea, milk, sugar, bread)- тогда has. 

my friend (1) has been taught.

My father (1) has been given a new job. 

The book (1) has been written

Tea (неисчесл) has been grown here since 19th century.

Если о много - тогда have. 

My friends have been taught english. 

The books have been written very quickly. 

I и you всегда будут употр-ся с have. Это надо выучить. 

Hope this will help. 

HAVE употребляется для i you they we
HAS для he,she,it
Have you read that book?
She has bought a new car
i think the waiter has forgotten us
we have read this book