could lactate
Regular verb: lactate - lactated- lactated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lactate
you could lactate
she could lactate
we could lactate
you could lactate
they could lactate 	I could be lactating
you could be lactating
she could be lactating
we could be lactating
you could be lactating
they could be lactating	I could have lactated
you could have lactated
she could have lactated
we could have lactated
you could have lactated
they could have lactated	I could have been lactating
you could have been lactating
she could have been lactating
we could have been lactating
you could have been lactating
they could have been lactating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not lactate
you could not lactate
she could not lactate
we could not lactate
you could not lactate
they could not lactate 	I could not be lactating
you could not be lactating
she could not be lactating
we could not be lactating
you could not be lactating
they could not be lactating	I could not have lactated
you could not have lactated
she could not have lactated
we could not have lactated
you could not have lactated
they could not have lactated	I could not have been lactating
you could not have been lactating
she could not have been lactating
we could not have been lactating
you could not have been lactating
they could not have been lactating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lactate?
could you lactate?
could she lactate?
could we lactate?
could you lactate?
could they lactate? 	could I be lactating?
could you be lactating?
could she be lactating?
could we be lactating?
could you be lactating?
could they be lactating? 	could I have lactated?
could you have lactated?
could she have lactated?
could we have lactated?
could you have lactated?
could they have lactated? 	could I have been lactating?
could you have been lactating?
could she have been lactating?
could we have been lactating?
could you have been lactating?
could they have been lactating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not lactate?
could you not lactate?
could she not lactate?
could we not lactate?
could you not lactate?
could they not lactate? 	could I not be lactating?
could you not be lactating?
could she not be lactating?
could we not be lactating?
could you not be lactating?
could they not be lactating? 	could I not have lactated?
could you not have lactated?
could she not have lactated?
could we not have lactated?
could you not have lactated?
could they not have lactated? 	could I not have been lactating?
could you not have been lactating?
could she not have been lactating?
could we not have been lactating?
could you not have been lactating?
could they not have been lactating?