The present perfect tense of open is:
The simple past tense of the word "open" is "opened."
you opened the door
The simple past is had.
The past simple of "have" is "had."
Past simple and simple past are both the same thing. They are both the past tense of a verb.
The simple past tense is climbed.
The simple past and past participle are both 'had'.
The simple past and past participle are both brought.
The simple past tense is studied.
"Listened" is the past simple of "listen" as well as the past participle.
Had is the past of have. A past simple sentence:I had a headache this morning
The simple past tense of speak is spoke.