Past Perfect Tense of Read is had read.
I had read the book before.
"Have read" is the present perfect tense.
You had read.
The future perfect tense of read is will have read.
Past perfect dream.
Existed is the past tense. The past perfect tense is had existed.
The past tense is bled, and the past perfect tense is had bled.
The past tense of sit is sat; the past perfect tense is had sat.
Yes and no. 'Red' generally refers to the color but although it is spelled the same way in both tenses, when being used in the past tense, the word 'read' is pronounced the same way as the word 'red'.
The past perfect tense of hope is had hoped.
The past perfect tense is had submitted.
The past perfect tense is had chosen.
The past perfect tense is "had confronted".