By adding -ed to regular verbs. Irregular verbs have a different word for their past tense and these must be learned - there is nothing that they all have in common like the regular verbs.
Formed is the past tense of form.
'Laid' is a the past tense form of 'Lay' which is a past tense form of 'lie'.
The past tense form of "lay" is "laid."
Is and are are present tense form of be. The past tense of be is was/were.
struck is the past tense verbStruck IS the past tense form...of the word strike.
The past tense form is destroyed.
To is not a verb and does not have a past tense form.
Is can be used in the past tense if it's in its past tense form, which is was.
The past perfect tense of "form" is "had formed".
"He hit you" is the past tense form. Hit is an irregular verb and the past tense form is also "hit".
"Stood" is the simple past tense form of the verb "stand." The past participle form is also "stood."
Yes, was and were are past tense forms of be. I/He/She/It was We/You/They were