English verb conjugation
SHOULD UNDULATE

Regular verb: undulate - undulated - undulated

Affirmation

Simple form	V-ing form
I'd undulate you'd undulate she'd undulate we'd undulate you'd undulate they'd undulate	I'd be undulating you'd be undulating she'd be undulating we'd be undulating you'd be undulating they'd be undulating
Perfect	V-ing perfect
I should've undulated you should've undulated she should've undulated we should've undulated you should've undulated they should've undulated	I should've been undulating you should've been undulating she should've been undulating we should've been undulating you should've been undulating they should've been undulating

Negation

Simple form	V-ing form
I shouldn't undulate you shouldn't undulate she shouldn't undulate we shouldn't undulate you shouldn't undulate they shouldn't undulate	I shouldn't be undulating you shouldn't be undulating she shouldn't be undulating we shouldn't be undulating you shouldn't be undulating they shouldn't be undulating
Perfect	V-ing perfect
I shouldn't have undulated you shouldn't have undulated she shouldn't have undulated we shouldn't have undulated you shouldn't have undulated they shouldn't have undulated	I shouldn't have been undulating you shouldn't have been undulating she shouldn't have been undulating we shouldn't have been undulating you shouldn't have been undulating they shouldn't have been undulating

Interrogative form

Simple form	V-ing form
should I undulate? should you undulate? should she undulate? should we undulate? should you undulate? should they undulate?	should I be undulating? should you be undulating? should she be undulating? should we be undulating? should you be undulating? should they be undulating?
Perfect	V-ing perfect
should I have undulated? should you have undulated? should she have undulated? should we have undulated? should you have undulated? should they have undulated?	should I have been undulating? should you have been undulating? should she have been undulating? should we have been undulating? should you have been undulating? should they have been undulating?

Interro-negative form

Simple form	V-ing form
shouldn't I undulate? shouldn't you undulate? shouldn't she undulate? shouldn't we undulate? shouldn't you undulate? shouldn't they undulate?	shouldn't I be undulating? shouldn't you be undulating? shouldn't she be undulating? shouldn't we be undulating? shouldn't you be undulating? shouldn't they be undulating?
Perfect	V-ing perfect
shouldn't I have undulated? shouldn't you have undulated? shouldn't she have undulated? shouldn't we have undulated? shouldn't you have undulated? shouldn't they have undulated?	shouldn't I have been undulating? shouldn't you have been undulating? shouldn't she have been undulating? shouldn't we have been undulating? shouldn't you have been undulating? shouldn't they have been undulating?