English grammar rule Couldve irregular verb
We could've watch the show.
The active voice of perfect tenses (past, present, and future) are formed using the verb “to have” and the past participle of another verb (had finished, has visited, have returned). To form the passive voice, simply add the word been between the verbs (had been chosen, has been made, have been finished). Usually, the end is -d, -ed, -en, -n, or -t.
Incorrect They had just took the trash away. Correct They had just taken the trash away. Incorrect Fred has arrive on time. Correct Fred has arrived on time. Incorrect Have you call your mother? Correct Have you called your mother?