can pack
Regular verb: pack - packed- packed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can pack
you can pack
she can pack
we can pack
you can pack
they can pack 	I can be packing
you can be packing
she can be packing
we can be packing
you can be packing
they can be packing	I can have packed
you can have packed
she can have packed
we can have packed
you can have packed
they can have packed	I can have been packing
you can have been packing
she can have been packing
we can have been packing
you can have been packing
they can have been packing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot pack
you cannot pack
she cannot pack
we cannot pack
you cannot pack
they cannot pack 	I cannot be packing
you cannot be packing
she cannot be packing
we cannot be packing
you cannot be packing
they cannot be packing	I cannot have packed
you cannot have packed
she cannot have packed
we cannot have packed
you cannot have packed
they cannot have packed	I cannot have been packing
you cannot have been packing
she cannot have been packing
we cannot have been packing
you cannot have been packing
they cannot have been packing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I pack?
can you pack?
can she pack?
can we pack?
can you pack?
can they pack? 	can I be packing?
can you be packing?
can she be packing?
can we be packing?
can you be packing?
can they be packing? 	can I have packed?
can you have packed?
can she have packed?
can we have packed?
can you have packed?
can they have packed? 	can I have been packing?
can you have been packing?
can she have been packing?
can we have been packing?
can you have been packing?
can they have been packing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not pack?
can you not pack?
can she not pack?
can we not pack?
can you not pack?
can they not pack? 	can I not be packing?
can you not be packing?
can she not be packing?
can we not be packing?
can you not be packing?
can they not be packing? 	can I not have packed?
can you not have packed?
can she not have packed?
can we not have packed?
can you not have packed?
can they not have packed? 	can I not have been packing?
can you not have been packing?
can she not have been packing?
can we not have been packing?
can you not have been packing?
can they not have been packing?