could pinpoint
Regular verb: pinpoint - pinpointed- pinpointed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pinpoint
you could pinpoint
he could pinpoint
we could pinpoint
you could pinpoint
they could pinpoint 	I could be pinpointing
you could be pinpointing
he could be pinpointing
we could be pinpointing
you could be pinpointing
they could be pinpointing	I could have pinpointed
you could have pinpointed
he could have pinpointed
we could have pinpointed
you could have pinpointed
they could have pinpointed	I could have been pinpointing
you could have been pinpointing
he could have been pinpointing
we could have been pinpointing
you could have been pinpointing
they could have been pinpointing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pinpoint
you couldn't pinpoint
he couldn't pinpoint
we couldn't pinpoint
you couldn't pinpoint
they couldn't pinpoint 	I couldn't be pinpointing
you couldn't be pinpointing
he couldn't be pinpointing
we couldn't be pinpointing
you couldn't be pinpointing
they couldn't be pinpointing	I couldn't have pinpointed
you couldn't have pinpointed
he couldn't have pinpointed
we couldn't have pinpointed
you couldn't have pinpointed
they couldn't have pinpointed	I couldn't have been pinpointing
you couldn't have been pinpointing
he couldn't have been pinpointing
we couldn't have been pinpointing
you couldn't have been pinpointing
they couldn't have been pinpointing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pinpoint?
could you pinpoint?
could he pinpoint?
could we pinpoint?
could you pinpoint?
could they pinpoint? 	could I be pinpointing?
could you be pinpointing?
could he be pinpointing?
could we be pinpointing?
could you be pinpointing?
could they be pinpointing? 	could I have pinpointed?
could you have pinpointed?
could he have pinpointed?
could we have pinpointed?
could you have pinpointed?
could they have pinpointed? 	could I have been pinpointing?
could you have been pinpointing?
could he have been pinpointing?
could we have been pinpointing?
could you have been pinpointing?
could they have been pinpointing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pinpoint?
couldn't you pinpoint?
couldn't he pinpoint?
couldn't we pinpoint?
couldn't you pinpoint?
couldn't they pinpoint? 	couldn't I be pinpointing?
couldn't you be pinpointing?
couldn't he be pinpointing?
couldn't we be pinpointing?
couldn't you be pinpointing?
couldn't they be pinpointing? 	couldn't I have pinpointed?
couldn't you have pinpointed?
couldn't he have pinpointed?
couldn't we have pinpointed?
couldn't you have pinpointed?
couldn't they have pinpointed? 	couldn't I have been pinpointing?
couldn't you have been pinpointing?
couldn't he have been pinpointing?
couldn't we have been pinpointing?
couldn't you have been pinpointing?
couldn't they have been pinpointing?