should flag
Regular verb: flag - flagged- flagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should flag
you should flag
she should flag
we should flag
you should flag
they should flag 	I should be flagging
you should be flagging
she should be flagging
we should be flagging
you should be flagging
they should be flagging	I should have flagged
you should have flagged
she should have flagged
we should have flagged
you should have flagged
they should have flagged	I should have been flagging
you should have been flagging
she should have been flagging
we should have been flagging
you should have been flagging
they should have been flagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not flag
you should not flag
she should not flag
we should not flag
you should not flag
they should not flag 	I should not be flagging
you should not be flagging
she should not be flagging
we should not be flagging
you should not be flagging
they should not be flagging	I should not have flagged
you should not have flagged
she should not have flagged
we should not have flagged
you should not have flagged
they should not have flagged	I should not have been flagging
you should not have been flagging
she should not have been flagging
we should not have been flagging
you should not have been flagging
they should not have been flagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I flag?
should you flag?
should she flag?
should we flag?
should you flag?
should they flag? 	should I be flagging?
should you be flagging?
should she be flagging?
should we be flagging?
should you be flagging?
should they be flagging? 	should I have flagged?
should you have flagged?
should she have flagged?
should we have flagged?
should you have flagged?
should they have flagged? 	should I have been flagging?
should you have been flagging?
should she have been flagging?
should we have been flagging?
should you have been flagging?
should they have been flagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not flag?
should you not flag?
should she not flag?
should we not flag?
should you not flag?
should they not flag? 	should I not be flagging?
should you not be flagging?
should she not be flagging?
should we not be flagging?
should you not be flagging?
should they not be flagging? 	should I not have flagged?
should you not have flagged?
should she not have flagged?
should we not have flagged?
should you not have flagged?
should they not have flagged? 	should I not have been flagging?
should you not have been flagging?
should she not have been flagging?
should we not have been flagging?
should you not have been flagging?
should they not have been flagging?