should flunk
Regular verb: flunk - flunked- flunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd flunk
you'd flunk
she'd flunk
we'd flunk
you'd flunk
they'd flunk 	I'd be flunking
you'd be flunking
she'd be flunking
we'd be flunking
you'd be flunking
they'd be flunking	I should've flunked
you should've flunked
she should've flunked
we should've flunked
you should've flunked
they should've flunked	I should've been flunking
you should've been flunking
she should've been flunking
we should've been flunking
you should've been flunking
they should've been flunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't flunk
you shouldn't flunk
she shouldn't flunk
we shouldn't flunk
you shouldn't flunk
they shouldn't flunk 	I shouldn't be flunking
you shouldn't be flunking
she shouldn't be flunking
we shouldn't be flunking
you shouldn't be flunking
they shouldn't be flunking	I shouldn't have flunked
you shouldn't have flunked
she shouldn't have flunked
we shouldn't have flunked
you shouldn't have flunked
they shouldn't have flunked	I shouldn't have been flunking
you shouldn't have been flunking
she shouldn't have been flunking
we shouldn't have been flunking
you shouldn't have been flunking
they shouldn't have been flunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I flunk?
should you flunk?
should she flunk?
should we flunk?
should you flunk?
should they flunk? 	should I be flunking?
should you be flunking?
should she be flunking?
should we be flunking?
should you be flunking?
should they be flunking? 	should I have flunked?
should you have flunked?
should she have flunked?
should we have flunked?
should you have flunked?
should they have flunked? 	should I have been flunking?
should you have been flunking?
should she have been flunking?
should we have been flunking?
should you have been flunking?
should they have been flunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I flunk?
shouldn't you flunk?
shouldn't she flunk?
shouldn't we flunk?
shouldn't you flunk?
shouldn't they flunk? 	shouldn't I be flunking?
shouldn't you be flunking?
shouldn't she be flunking?
shouldn't we be flunking?
shouldn't you be flunking?
shouldn't they be flunking? 	shouldn't I have flunked?
shouldn't you have flunked?
shouldn't she have flunked?
shouldn't we have flunked?
shouldn't you have flunked?
shouldn't they have flunked? 	shouldn't I have been flunking?
shouldn't you have been flunking?
shouldn't she have been flunking?
shouldn't we have been flunking?
shouldn't you have been flunking?
shouldn't they have been flunking?