should piggyback
Regular verb: piggyback - piggybacked- piggybacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should piggyback
you should piggyback
she should piggyback
we should piggyback
you should piggyback
they should piggyback 	I should be piggybacking
you should be piggybacking
she should be piggybacking
we should be piggybacking
you should be piggybacking
they should be piggybacking	I should have piggybacked
you should have piggybacked
she should have piggybacked
we should have piggybacked
you should have piggybacked
they should have piggybacked	I should have been piggybacking
you should have been piggybacking
she should have been piggybacking
we should have been piggybacking
you should have been piggybacking
they should have been piggybacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not piggyback
you should not piggyback
she should not piggyback
we should not piggyback
you should not piggyback
they should not piggyback 	I should not be piggybacking
you should not be piggybacking
she should not be piggybacking
we should not be piggybacking
you should not be piggybacking
they should not be piggybacking	I should not have piggybacked
you should not have piggybacked
she should not have piggybacked
we should not have piggybacked
you should not have piggybacked
they should not have piggybacked	I should not have been piggybacking
you should not have been piggybacking
she should not have been piggybacking
we should not have been piggybacking
you should not have been piggybacking
they should not have been piggybacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I piggyback?
should you piggyback?
should she piggyback?
should we piggyback?
should you piggyback?
should they piggyback? 	should I be piggybacking?
should you be piggybacking?
should she be piggybacking?
should we be piggybacking?
should you be piggybacking?
should they be piggybacking? 	should I have piggybacked?
should you have piggybacked?
should she have piggybacked?
should we have piggybacked?
should you have piggybacked?
should they have piggybacked? 	should I have been piggybacking?
should you have been piggybacking?
should she have been piggybacking?
should we have been piggybacking?
should you have been piggybacking?
should they have been piggybacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not piggyback?
should you not piggyback?
should she not piggyback?
should we not piggyback?
should you not piggyback?
should they not piggyback? 	should I not be piggybacking?
should you not be piggybacking?
should she not be piggybacking?
should we not be piggybacking?
should you not be piggybacking?
should they not be piggybacking? 	should I not have piggybacked?
should you not have piggybacked?
should she not have piggybacked?
should we not have piggybacked?
should you not have piggybacked?
should they not have piggybacked? 	should I not have been piggybacking?
should you not have been piggybacking?
should she not have been piggybacking?
should we not have been piggybacking?
should you not have been piggybacking?
should they not have been piggybacking?