should titter
Regular verb: titter - tittered- tittered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd titter
you'd titter
she'd titter
we'd titter
you'd titter
they'd titter 	I'd be tittering
you'd be tittering
she'd be tittering
we'd be tittering
you'd be tittering
they'd be tittering	I should've tittered
you should've tittered
she should've tittered
we should've tittered
you should've tittered
they should've tittered	I should've been tittering
you should've been tittering
she should've been tittering
we should've been tittering
you should've been tittering
they should've been tittering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't titter
you shouldn't titter
she shouldn't titter
we shouldn't titter
you shouldn't titter
they shouldn't titter 	I shouldn't be tittering
you shouldn't be tittering
she shouldn't be tittering
we shouldn't be tittering
you shouldn't be tittering
they shouldn't be tittering	I shouldn't have tittered
you shouldn't have tittered
she shouldn't have tittered
we shouldn't have tittered
you shouldn't have tittered
they shouldn't have tittered	I shouldn't have been tittering
you shouldn't have been tittering
she shouldn't have been tittering
we shouldn't have been tittering
you shouldn't have been tittering
they shouldn't have been tittering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I titter?
should you titter?
should she titter?
should we titter?
should you titter?
should they titter? 	should I be tittering?
should you be tittering?
should she be tittering?
should we be tittering?
should you be tittering?
should they be tittering? 	should I have tittered?
should you have tittered?
should she have tittered?
should we have tittered?
should you have tittered?
should they have tittered? 	should I have been tittering?
should you have been tittering?
should she have been tittering?
should we have been tittering?
should you have been tittering?
should they have been tittering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I titter?
shouldn't you titter?
shouldn't she titter?
shouldn't we titter?
shouldn't you titter?
shouldn't they titter? 	shouldn't I be tittering?
shouldn't you be tittering?
shouldn't she be tittering?
shouldn't we be tittering?
shouldn't you be tittering?
shouldn't they be tittering? 	shouldn't I have tittered?
shouldn't you have tittered?
shouldn't she have tittered?
shouldn't we have tittered?
shouldn't you have tittered?
shouldn't they have tittered? 	shouldn't I have been tittering?
shouldn't you have been tittering?
shouldn't she have been tittering?
shouldn't we have been tittering?
shouldn't you have been tittering?
shouldn't they have been tittering?