can sire
Regular verb: sire - sired- sired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sire
you can sire
she can sire
we can sire
you can sire
they can sire 	I can be siring
you can be siring
she can be siring
we can be siring
you can be siring
they can be siring	I can have sired
you can have sired
she can have sired
we can have sired
you can have sired
they can have sired	I can have been siring
you can have been siring
she can have been siring
we can have been siring
you can have been siring
they can have been siring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot sire
you cannot sire
she cannot sire
we cannot sire
you cannot sire
they cannot sire 	I cannot be siring
you cannot be siring
she cannot be siring
we cannot be siring
you cannot be siring
they cannot be siring	I cannot have sired
you cannot have sired
she cannot have sired
we cannot have sired
you cannot have sired
they cannot have sired	I cannot have been siring
you cannot have been siring
she cannot have been siring
we cannot have been siring
you cannot have been siring
they cannot have been siring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sire?
can you sire?
can she sire?
can we sire?
can you sire?
can they sire? 	can I be siring?
can you be siring?
can she be siring?
can we be siring?
can you be siring?
can they be siring? 	can I have sired?
can you have sired?
can she have sired?
can we have sired?
can you have sired?
can they have sired? 	can I have been siring?
can you have been siring?
can she have been siring?
can we have been siring?
can you have been siring?
can they have been siring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not sire?
can you not sire?
can she not sire?
can we not sire?
can you not sire?
can they not sire? 	can I not be siring?
can you not be siring?
can she not be siring?
can we not be siring?
can you not be siring?
can they not be siring? 	can I not have sired?
can you not have sired?
can she not have sired?
can we not have sired?
can you not have sired?
can they not have sired? 	can I not have been siring?
can you not have been siring?
can she not have been siring?
can we not have been siring?
can you not have been siring?
can they not have been siring?