Yes, "be" is in the simple past tense form: was (for singular subjects like I, he, she) and were (for plural subjects like we, you, they).
The simple past tense of the word "explain" is "explained."
The simple past tense of the word "open" is "opened."
The word "hit" remains the same in both the simple present and simple past tense.
The simple past of "to shine" is "shone."
The past tense of injure is injured.
The simple past tense of the word "open" is "opened."
The simple past tense of the word "explain" is "explained."
Simple is not a verb, so it doesn't have a past tense.
The simple past tense of be is was and were.The simple past tense of rain is rained.
The word "hit" remains the same in both the simple present and simple past tense.
The simple past tense is took.
The past tense of injure is injured.
'Bit' is the simple past tense of bite.
The simple past tense (and the past participle) is dropped.
The simple past of "to shine" is "shone."
The simple past tense and past participle forms are both bought.
Simple is not a verb therefore it doesn't have a past tense. The past of perfect is perfected