should undermine
Regular verb: undermine - undermined- undermined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd undermine
you'd undermine
she'd undermine
we'd undermine
you'd undermine
they'd undermine 	I'd be undermining
you'd be undermining
she'd be undermining
we'd be undermining
you'd be undermining
they'd be undermining	I should've undermined
you should've undermined
she should've undermined
we should've undermined
you should've undermined
they should've undermined	I should've been undermining
you should've been undermining
she should've been undermining
we should've been undermining
you should've been undermining
they should've been undermining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't undermine
you shouldn't undermine
she shouldn't undermine
we shouldn't undermine
you shouldn't undermine
they shouldn't undermine 	I shouldn't be undermining
you shouldn't be undermining
she shouldn't be undermining
we shouldn't be undermining
you shouldn't be undermining
they shouldn't be undermining	I shouldn't have undermined
you shouldn't have undermined
she shouldn't have undermined
we shouldn't have undermined
you shouldn't have undermined
they shouldn't have undermined	I shouldn't have been undermining
you shouldn't have been undermining
she shouldn't have been undermining
we shouldn't have been undermining
you shouldn't have been undermining
they shouldn't have been undermining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I undermine?
should you undermine?
should she undermine?
should we undermine?
should you undermine?
should they undermine? 	should I be undermining?
should you be undermining?
should she be undermining?
should we be undermining?
should you be undermining?
should they be undermining? 	should I have undermined?
should you have undermined?
should she have undermined?
should we have undermined?
should you have undermined?
should they have undermined? 	should I have been undermining?
should you have been undermining?
should she have been undermining?
should we have been undermining?
should you have been undermining?
should they have been undermining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I undermine?
shouldn't you undermine?
shouldn't she undermine?
shouldn't we undermine?
shouldn't you undermine?
shouldn't they undermine? 	shouldn't I be undermining?
shouldn't you be undermining?
shouldn't she be undermining?
shouldn't we be undermining?
shouldn't you be undermining?
shouldn't they be undermining? 	shouldn't I have undermined?
shouldn't you have undermined?
shouldn't she have undermined?
shouldn't we have undermined?
shouldn't you have undermined?
shouldn't they have undermined? 	shouldn't I have been undermining?
shouldn't you have been undermining?
shouldn't she have been undermining?
shouldn't we have been undermining?
shouldn't you have been undermining?
shouldn't they have been undermining?