should whistle
Regular verb: whistle - whistled- whistled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd whistle
you'd whistle
she'd whistle
we'd whistle
you'd whistle
they'd whistle 	I'd be whistling
you'd be whistling
she'd be whistling
we'd be whistling
you'd be whistling
they'd be whistling	I should've whistled
you should've whistled
she should've whistled
we should've whistled
you should've whistled
they should've whistled	I should've been whistling
you should've been whistling
she should've been whistling
we should've been whistling
you should've been whistling
they should've been whistling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't whistle
you shouldn't whistle
she shouldn't whistle
we shouldn't whistle
you shouldn't whistle
they shouldn't whistle 	I shouldn't be whistling
you shouldn't be whistling
she shouldn't be whistling
we shouldn't be whistling
you shouldn't be whistling
they shouldn't be whistling	I shouldn't have whistled
you shouldn't have whistled
she shouldn't have whistled
we shouldn't have whistled
you shouldn't have whistled
they shouldn't have whistled	I shouldn't have been whistling
you shouldn't have been whistling
she shouldn't have been whistling
we shouldn't have been whistling
you shouldn't have been whistling
they shouldn't have been whistling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I whistle?
should you whistle?
should she whistle?
should we whistle?
should you whistle?
should they whistle? 	should I be whistling?
should you be whistling?
should she be whistling?
should we be whistling?
should you be whistling?
should they be whistling? 	should I have whistled?
should you have whistled?
should she have whistled?
should we have whistled?
should you have whistled?
should they have whistled? 	should I have been whistling?
should you have been whistling?
should she have been whistling?
should we have been whistling?
should you have been whistling?
should they have been whistling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I whistle?
shouldn't you whistle?
shouldn't she whistle?
shouldn't we whistle?
shouldn't you whistle?
shouldn't they whistle? 	shouldn't I be whistling?
shouldn't you be whistling?
shouldn't she be whistling?
shouldn't we be whistling?
shouldn't you be whistling?
shouldn't they be whistling? 	shouldn't I have whistled?
shouldn't you have whistled?
shouldn't she have whistled?
shouldn't we have whistled?
shouldn't you have whistled?
shouldn't they have whistled? 	shouldn't I have been whistling?
shouldn't you have been whistling?
shouldn't she have been whistling?
shouldn't we have been whistling?
shouldn't you have been whistling?
shouldn't they have been whistling?