The past tense of "to occur" is occurred.
Some examples: Past tense - worked. Future tense - will work. Past tense - played. Future tense - will play. Past tense - lied. Future tense - will lie.
Tired is an adjective it doesn't have a past tense.
Enthusiasm is a noun and doesn't have a past tense. Only verbs have a past tense.
Lost is the past tense of lose.
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense of "she do" is "she did."
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would" and the past tense of "be" is "was" or "were" depending on the subject (singular or plural).
The past tense of "have" is "had."
HAD is the Past Tense of TO HAVE.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
The past tense of "you will not" is "you would not."
The past tense of "exist" is "existed." The past perfect tense is "had existed."