Slang's Alibi

Slang bends rules for a living, so when the rules got rewritten everybody looked at him. Name what he says he was doing instead.

Progressive verb (the -ing form)The -ing form: grinning, whistling, waiting.Mild interjection (comma)Try Gentlemen, Alright, or Easy.Preposition (where)Try behind, under, or beside.Descriptive adjectiveTry borrowed, hulking, or purple.Concrete common nounSomething you can see, hear, smell, taste, or touch: jukebox, ladder, aquarium.Irregular past tense verbA past tense that does not end in -ed: slid, bit, lit.Adverb (how)Try patiently, twice, or sideways.Adverb (when)Try instantly, eventually, or later.Adverb (to what extent)Try entirely, barely, or magnificently.Collective nounA word that names a group of people or things: squad, cluster, jury.

Every blank has to be filled before this one can finish. Let's go.