should bubble
Regular verb: bubble - bubbled- bubbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should bubble
you should bubble
he should bubble
we should bubble
you should bubble
they should bubble 	I should be bubbling
you should be bubbling
he should be bubbling
we should be bubbling
you should be bubbling
they should be bubbling	I should have bubbled
you should have bubbled
he should have bubbled
we should have bubbled
you should have bubbled
they should have bubbled	I should have been bubbling
you should have been bubbling
he should have been bubbling
we should have been bubbling
you should have been bubbling
they should have been bubbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not bubble
you should not bubble
he should not bubble
we should not bubble
you should not bubble
they should not bubble 	I should not be bubbling
you should not be bubbling
he should not be bubbling
we should not be bubbling
you should not be bubbling
they should not be bubbling	I should not have bubbled
you should not have bubbled
he should not have bubbled
we should not have bubbled
you should not have bubbled
they should not have bubbled	I should not have been bubbling
you should not have been bubbling
he should not have been bubbling
we should not have been bubbling
you should not have been bubbling
they should not have been bubbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I bubble?
should you bubble?
should he bubble?
should we bubble?
should you bubble?
should they bubble? 	should I be bubbling?
should you be bubbling?
should he be bubbling?
should we be bubbling?
should you be bubbling?
should they be bubbling? 	should I have bubbled?
should you have bubbled?
should he have bubbled?
should we have bubbled?
should you have bubbled?
should they have bubbled? 	should I have been bubbling?
should you have been bubbling?
should he have been bubbling?
should we have been bubbling?
should you have been bubbling?
should they have been bubbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not bubble?
should you not bubble?
should he not bubble?
should we not bubble?
should you not bubble?
should they not bubble? 	should I not be bubbling?
should you not be bubbling?
should he not be bubbling?
should we not be bubbling?
should you not be bubbling?
should they not be bubbling? 	should I not have bubbled?
should you not have bubbled?
should he not have bubbled?
should we not have bubbled?
should you not have bubbled?
should they not have bubbled? 	should I not have been bubbling?
should you not have been bubbling?
should he not have been bubbling?
should we not have been bubbling?
should you not have been bubbling?
should they not have been bubbling?