Curiosity killed the cat.
"Every cloud has a silver lining."
Much does not have a past tense as it's not a verb. Only verbs have past tenses.Much is an adjective and does not have a past tense.
Enthusiasm is a noun and doesn't have a past tense. Only verbs have a past tense.
"Stool" is a noun and so doesn't have a past tense. Only verbs have a past tense.
Situation is a noun and so doesn't have a past tense. Only verbs have a past tense.
The word magnetic doesn't have a past tense as it is an adjective. It is only verbs that have a past tense.
Annie is a noun and so doesn't have a past tense. Only verbs have a past tense.
Fashionable is an adjective and so doesn't have a past tense. Only verbs have a past tense.
Diagnosis is a noun and so doesn't have a past tense. Only verbs have a past tense.
Octopus is a noun and so doesn't have a past tense. Only verbs have a past tense.
Modern doesn't have a past tense as it's an adjective. Only verbs have a past tense.
Opportune is an adjective and so doesn't have a past tense. Only verbs have a past tense.
The word "prone" is an adjective and so doesn't have a past tense. Only verbs have a past tense.