can sack
Regular verb: sack - sacked- sacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sack
you can sack
she can sack
we can sack
you can sack
they can sack 	I can be sacking
you can be sacking
she can be sacking
we can be sacking
you can be sacking
they can be sacking	I can have sacked
you can have sacked
she can have sacked
we can have sacked
you can have sacked
they can have sacked	I can have been sacking
you can have been sacking
she can have been sacking
we can have been sacking
you can have been sacking
they can have been sacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't sack
you can't sack
she can't sack
we can't sack
you can't sack
they can't sack 	I can't be sacking
you can't be sacking
she can't be sacking
we can't be sacking
you can't be sacking
they can't be sacking	I can't have sacked
you can't have sacked
she can't have sacked
we can't have sacked
you can't have sacked
they can't have sacked	I can't have been sacking
you can't have been sacking
she can't have been sacking
we can't have been sacking
you can't have been sacking
they can't have been sacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sack?
can you sack?
can she sack?
can we sack?
can you sack?
can they sack? 	can I be sacking?
can you be sacking?
can she be sacking?
can we be sacking?
can you be sacking?
can they be sacking? 	can I have sacked?
can you have sacked?
can she have sacked?
can we have sacked?
can you have sacked?
can they have sacked? 	can I have been sacking?
can you have been sacking?
can she have been sacking?
can we have been sacking?
can you have been sacking?
can they have been sacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I sack?
can't you sack?
can't she sack?
can't we sack?
can't you sack?
can't they sack? 	can't I be sacking?
can't you be sacking?
can't she be sacking?
can't we be sacking?
can't you be sacking?
can't they be sacking? 	can't I have sacked?
can't you have sacked?
can't she have sacked?
can't we have sacked?
can't you have sacked?
can't they have sacked? 	can't I have been sacking?
can't you have been sacking?
can't she have been sacking?
can't we have been sacking?
can't you have been sacking?
can't they have been sacking?