The past tense is ad libbed.
The past tense of 'ad hoc' is not applicable as 'ad hoc' is not a verb. It is a Latin phrase meaning "for this purpose" or "created for a specific purpose."
ad lib is a latin abbreviation for 'freely'
Tim Conway is quite masterful with the ad lib. I prefer to ad lib this part of the scene.
Ad Lib - typeface - was created in 1961.
Another term for ad lib is improv, or improvise.
The duration of Ad-lib Night is 1.65 hours.
Ad-lib Night was created on 2006-11-30.
The cast of Ad and Lib - 1954 includes: Joe Austin as Ad
Ad Lib - 1981 I was released on: USA: 1981 (limited)
An ad lib is a portion of a musical work which is to be played freely, or at one's own pleasure.
"Ad lib" is short for the Latin phrase "ad libitum," which means "at one's pleasure" or "at will." In performance or presentation, doing something ad lib means doing it spontaneously or without prior preparation.