Round is a regular verb so past and past participle are rounded.
He rounded the total to the nearest dollar.
The past tense of round is rounded.
"Has" is the present tense form of the verb "have." The past tense form of "has" is "had."
The past tense form is destroyed.
struck is the past tense verbStruck IS the past tense form...of the word strike.
Formed is the past tense of form.
The past tense is laid.
The past tense is held.
Is and are are present tense form of be. The past tense of be is was/were.
Do is the present tense. The past tense is did. The past participle is done.
Did not do it -> did not do it (same past tense form)
The word "that" is not a verb and does not have a past tense form.
No 'is' is present tense. am/is/are = present tense was/were = past tense