The simple past is collected.
collected
The past tense of collect is collected.
collect
If you meant what is collect in past tense, It is collected.
The past perfect tense is had collected.
The simple past 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.
Had is the past of have. A past simple sentence:I had a headache this morning
The four forms of simple past tense in English are regular past tense (e.g., walked), irregular past tense (e.g., ate), past continuous tense (e.g., was walking), and past perfect tense (e.g., had eaten).
pack - packed; collect - collected