The past tense of "die" is "died"
died
Present tense - you are. Past tense - you were.
Has is the present tense, third person singular conjugation of have. The past tense and past participle of have is had.
No, "is" isn't the past tense of is. "Is" is the present tense, third person singular conjugation of be. The past tense of "is" is "was".
Does is the present tense, third person singular conjugation of the verb do. The past tense of do is did, and the future tense is will do.
Am is the present tense, first person singular conjugation of be. The past tense is was, and the past participle is been.
The second person past tense for study is "you studied".
It is past tense, first person singular
"Is" is the present tense, third person singular conjugation of be. The past tense is was, and the past participle is been.
Do is the present tense. The past tense is did. The past participle is done.
Had is the past tense of have. Has is the present tense, third person singular conjugation of have.
Exists is not past tense. It is the present tense, third person singular conjugation of exist. Existed is the past tense.