The Perfect Tense refers to an action that happened or to something that someone did in the past time.
Caupo MUSSAVIT. The innkeeper MUTTERED.
(perfect=a single action, completed in the past)
Singular perfect tense endings 1) -i
Plural perfect tense endings 1) -imus
The perfect stem is the third form of the word, its the third one in the dictionary.
Inspicio, Inspicicere, Inspexi (third form), Inspectus
Three examples of verbs in the perfect tense are:
Docui, Duxi, Dedi.