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 couldn't lactate
you couldn't lactate
she couldn't lactate
we couldn't lactate
you couldn't lactate
they couldn't lactate 	I couldn't be lactating
you couldn't be lactating
she couldn't be lactating
we couldn't be lactating
you couldn't be lactating
they couldn't be lactating	I couldn't have lactated
you couldn't have lactated
she couldn't have lactated
we couldn't have lactated
you couldn't have lactated
they couldn't have lactated	I couldn't have been lactating
you couldn't have been lactating
she couldn't have been lactating
we couldn't have been lactating
you couldn't have been lactating
they couldn't 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 	
couldn't I lactate?
couldn't you lactate?
couldn't she lactate?
couldn't we lactate?
couldn't you lactate?
couldn't they lactate? 	couldn't I be lactating?
couldn't you be lactating?
couldn't she be lactating?
couldn't we be lactating?
couldn't you be lactating?
couldn't they be lactating? 	couldn't I have lactated?
couldn't you have lactated?
couldn't she have lactated?
couldn't we have lactated?
couldn't you have lactated?
couldn't they have lactated? 	couldn't I have been lactating?
couldn't you have been lactating?
couldn't she have been lactating?
couldn't we have been lactating?
couldn't you have been lactating?
couldn't they have been lactating?