should lifeguard
Regular verb: lifeguard - lifeguarded- lifeguarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd lifeguard
you'd lifeguard
he'd lifeguard
we'd lifeguard
you'd lifeguard
they'd lifeguard 	I'd be lifeguarding
you'd be lifeguarding
he'd be lifeguarding
we'd be lifeguarding
you'd be lifeguarding
they'd be lifeguarding	I should've lifeguarded
you should've lifeguarded
he should've lifeguarded
we should've lifeguarded
you should've lifeguarded
they should've lifeguarded	I should've been lifeguarding
you should've been lifeguarding
he should've been lifeguarding
we should've been lifeguarding
you should've been lifeguarding
they should've been lifeguarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't lifeguard
you shouldn't lifeguard
he shouldn't lifeguard
we shouldn't lifeguard
you shouldn't lifeguard
they shouldn't lifeguard 	I shouldn't be lifeguarding
you shouldn't be lifeguarding
he shouldn't be lifeguarding
we shouldn't be lifeguarding
you shouldn't be lifeguarding
they shouldn't be lifeguarding	I shouldn't have lifeguarded
you shouldn't have lifeguarded
he shouldn't have lifeguarded
we shouldn't have lifeguarded
you shouldn't have lifeguarded
they shouldn't have lifeguarded	I shouldn't have been lifeguarding
you shouldn't have been lifeguarding
he shouldn't have been lifeguarding
we shouldn't have been lifeguarding
you shouldn't have been lifeguarding
they shouldn't have been lifeguarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I lifeguard?
should you lifeguard?
should he lifeguard?
should we lifeguard?
should you lifeguard?
should they lifeguard? 	should I be lifeguarding?
should you be lifeguarding?
should he be lifeguarding?
should we be lifeguarding?
should you be lifeguarding?
should they be lifeguarding? 	should I have lifeguarded?
should you have lifeguarded?
should he have lifeguarded?
should we have lifeguarded?
should you have lifeguarded?
should they have lifeguarded? 	should I have been lifeguarding?
should you have been lifeguarding?
should he have been lifeguarding?
should we have been lifeguarding?
should you have been lifeguarding?
should they have been lifeguarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I lifeguard?
shouldn't you lifeguard?
shouldn't he lifeguard?
shouldn't we lifeguard?
shouldn't you lifeguard?
shouldn't they lifeguard? 	shouldn't I be lifeguarding?
shouldn't you be lifeguarding?
shouldn't he be lifeguarding?
shouldn't we be lifeguarding?
shouldn't you be lifeguarding?
shouldn't they be lifeguarding? 	shouldn't I have lifeguarded?
shouldn't you have lifeguarded?
shouldn't he have lifeguarded?
shouldn't we have lifeguarded?
shouldn't you have lifeguarded?
shouldn't they have lifeguarded? 	shouldn't I have been lifeguarding?
shouldn't you have been lifeguarding?
shouldn't he have been lifeguarding?
shouldn't we have been lifeguarding?
shouldn't you have been lifeguarding?
shouldn't they have been lifeguarding?