could collocate
Regular verb: collocate - collocated- collocated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could collocate
you could collocate
she could collocate
we could collocate
you could collocate
they could collocate 	I could be collocating
you could be collocating
she could be collocating
we could be collocating
you could be collocating
they could be collocating	I could have collocated
you could have collocated
she could have collocated
we could have collocated
you could have collocated
they could have collocated	I could have been collocating
you could have been collocating
she could have been collocating
we could have been collocating
you could have been collocating
they could have been collocating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't collocate
you couldn't collocate
she couldn't collocate
we couldn't collocate
you couldn't collocate
they couldn't collocate 	I couldn't be collocating
you couldn't be collocating
she couldn't be collocating
we couldn't be collocating
you couldn't be collocating
they couldn't be collocating	I couldn't have collocated
you couldn't have collocated
she couldn't have collocated
we couldn't have collocated
you couldn't have collocated
they couldn't have collocated	I couldn't have been collocating
you couldn't have been collocating
she couldn't have been collocating
we couldn't have been collocating
you couldn't have been collocating
they couldn't have been collocating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I collocate?
could you collocate?
could she collocate?
could we collocate?
could you collocate?
could they collocate? 	could I be collocating?
could you be collocating?
could she be collocating?
could we be collocating?
could you be collocating?
could they be collocating? 	could I have collocated?
could you have collocated?
could she have collocated?
could we have collocated?
could you have collocated?
could they have collocated? 	could I have been collocating?
could you have been collocating?
could she have been collocating?
could we have been collocating?
could you have been collocating?
could they have been collocating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I collocate?
couldn't you collocate?
couldn't she collocate?
couldn't we collocate?
couldn't you collocate?
couldn't they collocate? 	couldn't I be collocating?
couldn't you be collocating?
couldn't she be collocating?
couldn't we be collocating?
couldn't you be collocating?
couldn't they be collocating? 	couldn't I have collocated?
couldn't you have collocated?
couldn't she have collocated?
couldn't we have collocated?
couldn't you have collocated?
couldn't they have collocated? 	couldn't I have been collocating?
couldn't you have been collocating?
couldn't she have been collocating?
couldn't we have been collocating?
couldn't you have been collocating?
couldn't they have been collocating?