should lesson
Regular verb: lesson - lessoned- lessoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd lesson
you'd lesson
she'd lesson
we'd lesson
you'd lesson
they'd lesson 	I'd be lessoning
you'd be lessoning
she'd be lessoning
we'd be lessoning
you'd be lessoning
they'd be lessoning	I should've lessoned
you should've lessoned
she should've lessoned
we should've lessoned
you should've lessoned
they should've lessoned	I should've been lessoning
you should've been lessoning
she should've been lessoning
we should've been lessoning
you should've been lessoning
they should've been lessoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't lesson
you shouldn't lesson
she shouldn't lesson
we shouldn't lesson
you shouldn't lesson
they shouldn't lesson 	I shouldn't be lessoning
you shouldn't be lessoning
she shouldn't be lessoning
we shouldn't be lessoning
you shouldn't be lessoning
they shouldn't be lessoning	I shouldn't have lessoned
you shouldn't have lessoned
she shouldn't have lessoned
we shouldn't have lessoned
you shouldn't have lessoned
they shouldn't have lessoned	I shouldn't have been lessoning
you shouldn't have been lessoning
she shouldn't have been lessoning
we shouldn't have been lessoning
you shouldn't have been lessoning
they shouldn't have been lessoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I lesson?
should you lesson?
should she lesson?
should we lesson?
should you lesson?
should they lesson? 	should I be lessoning?
should you be lessoning?
should she be lessoning?
should we be lessoning?
should you be lessoning?
should they be lessoning? 	should I have lessoned?
should you have lessoned?
should she have lessoned?
should we have lessoned?
should you have lessoned?
should they have lessoned? 	should I have been lessoning?
should you have been lessoning?
should she have been lessoning?
should we have been lessoning?
should you have been lessoning?
should they have been lessoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I lesson?
shouldn't you lesson?
shouldn't she lesson?
shouldn't we lesson?
shouldn't you lesson?
shouldn't they lesson? 	shouldn't I be lessoning?
shouldn't you be lessoning?
shouldn't she be lessoning?
shouldn't we be lessoning?
shouldn't you be lessoning?
shouldn't they be lessoning? 	shouldn't I have lessoned?
shouldn't you have lessoned?
shouldn't she have lessoned?
shouldn't we have lessoned?
shouldn't you have lessoned?
shouldn't they have lessoned? 	shouldn't I have been lessoning?
shouldn't you have been lessoning?
shouldn't she have been lessoning?
shouldn't we have been lessoning?
shouldn't you have been lessoning?
shouldn't they have been lessoning?