can sack
Regular verb: sack - sacked- sacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sack
you can sack
he can sack
we can sack
you can sack
they can sack 	I can be sacking
you can be sacking
he can be sacking
we can be sacking
you can be sacking
they can be sacking	I can have sacked
you can have sacked
he 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
he 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 cannot sack
you cannot sack
he cannot sack
we cannot sack
you cannot sack
they cannot sack 	I cannot be sacking
you cannot be sacking
he cannot be sacking
we cannot be sacking
you cannot be sacking
they cannot be sacking	I cannot have sacked
you cannot have sacked
he cannot have sacked
we cannot have sacked
you cannot have sacked
they cannot have sacked	I cannot have been sacking
you cannot have been sacking
he cannot have been sacking
we cannot have been sacking
you cannot have been sacking
they cannot have been sacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sack?
can you sack?
can he sack?
can we sack?
can you sack?
can they sack? 	can I be sacking?
can you be sacking?
can he be sacking?
can we be sacking?
can you be sacking?
can they be sacking? 	can I have sacked?
can you have sacked?
can he 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 he 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 I not sack?
can you not sack?
can he not sack?
can we not sack?
can you not sack?
can they not sack? 	can I not be sacking?
can you not be sacking?
can he not be sacking?
can we not be sacking?
can you not be sacking?
can they not be sacking? 	can I not have sacked?
can you not have sacked?
can he not have sacked?
can we not have sacked?
can you not have sacked?
can they not have sacked? 	can I not have been sacking?
can you not have been sacking?
can he not have been sacking?
can we not have been sacking?
can you not have been sacking?
can they not have been sacking?