should twin
Regular verb: twin - twinned- twinned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd twin
you'd twin
she'd twin
we'd twin
you'd twin
they'd twin 	I'd be twinning
you'd be twinning
she'd be twinning
we'd be twinning
you'd be twinning
they'd be twinning	I should've twinned
you should've twinned
she should've twinned
we should've twinned
you should've twinned
they should've twinned	I should've been twinning
you should've been twinning
she should've been twinning
we should've been twinning
you should've been twinning
they should've been twinning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't twin
you shouldn't twin
she shouldn't twin
we shouldn't twin
you shouldn't twin
they shouldn't twin 	I shouldn't be twinning
you shouldn't be twinning
she shouldn't be twinning
we shouldn't be twinning
you shouldn't be twinning
they shouldn't be twinning	I shouldn't have twinned
you shouldn't have twinned
she shouldn't have twinned
we shouldn't have twinned
you shouldn't have twinned
they shouldn't have twinned	I shouldn't have been twinning
you shouldn't have been twinning
she shouldn't have been twinning
we shouldn't have been twinning
you shouldn't have been twinning
they shouldn't have been twinning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I twin?
should you twin?
should she twin?
should we twin?
should you twin?
should they twin? 	should I be twinning?
should you be twinning?
should she be twinning?
should we be twinning?
should you be twinning?
should they be twinning? 	should I have twinned?
should you have twinned?
should she have twinned?
should we have twinned?
should you have twinned?
should they have twinned? 	should I have been twinning?
should you have been twinning?
should she have been twinning?
should we have been twinning?
should you have been twinning?
should they have been twinning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I twin?
shouldn't you twin?
shouldn't she twin?
shouldn't we twin?
shouldn't you twin?
shouldn't they twin? 	shouldn't I be twinning?
shouldn't you be twinning?
shouldn't she be twinning?
shouldn't we be twinning?
shouldn't you be twinning?
shouldn't they be twinning? 	shouldn't I have twinned?
shouldn't you have twinned?
shouldn't she have twinned?
shouldn't we have twinned?
shouldn't you have twinned?
shouldn't they have twinned? 	shouldn't I have been twinning?
shouldn't you have been twinning?
shouldn't she have been twinning?
shouldn't we have been twinning?
shouldn't you have been twinning?
shouldn't they have been twinning?