could sire
Regular verb: sire - sired- sired

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

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

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

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