The present tense is:
The present tense for "mix" is "mix" for first and second person, and "mixes" for third person singular. For example: I mix the ingredients, you mix the batter, he mixes the drinks.
The verb is is the present tense.
The phrase "is was begun" is not grammatically correct. It appears to be a mix of present and past tense forms. The correct forms would be either "is begun" for present tense or "was begun" for past tense, depending on the intended meaning.
The past tense of did is did. The present tense of did is do. The future tense of did is will do.
A "mix" is a noun and does not have a past tense. The past tense of the verb mix is mixed.
It was, (past tense) it is, (present tense) it will be( future tense)
Past tense I had Present tense I have Future Tense I will have
"Has" is in present tense. The past tense is "had".
The past tense of mix is mixed.
No 'is' is present tense. am/is/are = present tense was/were = past tense
Present tense
the present of did is didnt Do is the present tense of did. Didn't is the past negative form