could collimate
Regular verb: collimate - collimated- collimated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could collimate
you could collimate
she could collimate
we could collimate
you could collimate
they could collimate 	I could be collimating
you could be collimating
she could be collimating
we could be collimating
you could be collimating
they could be collimating	I could have collimated
you could have collimated
she could have collimated
we could have collimated
you could have collimated
they could have collimated	I could have been collimating
you could have been collimating
she could have been collimating
we could have been collimating
you could have been collimating
they could have been collimating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't collimate
you couldn't collimate
she couldn't collimate
we couldn't collimate
you couldn't collimate
they couldn't collimate 	I couldn't be collimating
you couldn't be collimating
she couldn't be collimating
we couldn't be collimating
you couldn't be collimating
they couldn't be collimating	I couldn't have collimated
you couldn't have collimated
she couldn't have collimated
we couldn't have collimated
you couldn't have collimated
they couldn't have collimated	I couldn't have been collimating
you couldn't have been collimating
she couldn't have been collimating
we couldn't have been collimating
you couldn't have been collimating
they couldn't have been collimating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I collimate?
could you collimate?
could she collimate?
could we collimate?
could you collimate?
could they collimate? 	could I be collimating?
could you be collimating?
could she be collimating?
could we be collimating?
could you be collimating?
could they be collimating? 	could I have collimated?
could you have collimated?
could she have collimated?
could we have collimated?
could you have collimated?
could they have collimated? 	could I have been collimating?
could you have been collimating?
could she have been collimating?
could we have been collimating?
could you have been collimating?
could they have been collimating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I collimate?
couldn't you collimate?
couldn't she collimate?
couldn't we collimate?
couldn't you collimate?
couldn't they collimate? 	couldn't I be collimating?
couldn't you be collimating?
couldn't she be collimating?
couldn't we be collimating?
couldn't you be collimating?
couldn't they be collimating? 	couldn't I have collimated?
couldn't you have collimated?
couldn't she have collimated?
couldn't we have collimated?
couldn't you have collimated?
couldn't they have collimated? 	couldn't I have been collimating?
couldn't you have been collimating?
couldn't she have been collimating?
couldn't we have been collimating?
couldn't you have been collimating?
couldn't they have been collimating?