English verb conjugation
SHOULD ZIP

Regular verb: zip - zipped - zipped

Affirmation

Simple form	V-ing form
I'd zip you'd zip he'd zip we'd zip you'd zip they'd zip	I'd be zipping you'd be zipping he'd be zipping we'd be zipping you'd be zipping they'd be zipping
Perfect	V-ing perfect
I should've zipped you should've zipped he should've zipped we should've zipped you should've zipped they should've zipped	I should've been zipping you should've been zipping he should've been zipping we should've been zipping you should've been zipping they should've been zipping

Negation

Simple form	V-ing form
I shouldn't zip you shouldn't zip he shouldn't zip we shouldn't zip you shouldn't zip they shouldn't zip	I shouldn't be zipping you shouldn't be zipping he shouldn't be zipping we shouldn't be zipping you shouldn't be zipping they shouldn't be zipping
Perfect	V-ing perfect
I shouldn't have zipped you shouldn't have zipped he shouldn't have zipped we shouldn't have zipped you shouldn't have zipped they shouldn't have zipped	I shouldn't have been zipping you shouldn't have been zipping he shouldn't have been zipping we shouldn't have been zipping you shouldn't have been zipping they shouldn't have been zipping

Interrogative form

Simple form	V-ing form
should I zip? should you zip? should he zip? should we zip? should you zip? should they zip?	should I be zipping? should you be zipping? should he be zipping? should we be zipping? should you be zipping? should they be zipping?
Perfect	V-ing perfect
should I have zipped? should you have zipped? should he have zipped? should we have zipped? should you have zipped? should they have zipped?	should I have been zipping? should you have been zipping? should he have been zipping? should we have been zipping? should you have been zipping? should they have been zipping?

Interro-negative form

Simple form	V-ing form
shouldn't I zip? shouldn't you zip? shouldn't he zip? shouldn't we zip? shouldn't you zip? shouldn't they zip?	shouldn't I be zipping? shouldn't you be zipping? shouldn't he be zipping? shouldn't we be zipping? shouldn't you be zipping? shouldn't they be zipping?
Perfect	V-ing perfect
shouldn't I have zipped? shouldn't you have zipped? shouldn't he have zipped? shouldn't we have zipped? shouldn't you have zipped? shouldn't they have zipped?	shouldn't I have been zipping? shouldn't you have been zipping? shouldn't he have been zipping? shouldn't we have been zipping? shouldn't you have been zipping? shouldn't they have been zipping?