I could pinpoint you could pinpoint he could pinpoint we could pinpoint you could pinpoint they could pinpoint
V-ing form
I could be pinpointing you could be pinpointing he could be pinpointing we could be pinpointing you could be pinpointing they could be pinpointing
Perfect
I could have pinpointed you could have pinpointed he could have pinpointed we could have pinpointed you could have pinpointed they could have pinpointed
V-ing perfect
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
I could not pinpoint you could not pinpoint he could not pinpoint we could not pinpoint you could not pinpoint they could not pinpoint
V-ing form
I could not be pinpointing you could not be pinpointing he could not be pinpointing we could not be pinpointing you could not be pinpointing they could not be pinpointing
Perfect
I could not have pinpointed you could not have pinpointed he could not have pinpointed we could not have pinpointed you could not have pinpointed they could not have pinpointed
V-ing perfect
I could not have been pinpointing you could not have been pinpointing he could not have been pinpointing we could not have been pinpointing you could not have been pinpointing they could not have been pinpointing
Interrogative form
Simple form
could I pinpoint? could you pinpoint? could he pinpoint? could we pinpoint? could you pinpoint? could they pinpoint?
V-ing form
could I be pinpointing? could you be pinpointing? could he be pinpointing? could we be pinpointing? could you be pinpointing? could they be pinpointing?
Perfect
could I have pinpointed? could you have pinpointed? could he have pinpointed? could we have pinpointed? could you have pinpointed? could they have pinpointed?
V-ing perfect
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
could I not pinpoint? could you not pinpoint? could he not pinpoint? could we not pinpoint? could you not pinpoint? could they not pinpoint?
V-ing form
could I not be pinpointing? could you not be pinpointing? could he not be pinpointing? could we not be pinpointing? could you not be pinpointing? could they not be pinpointing?
Perfect
could I not have pinpointed? could you not have pinpointed? could he not have pinpointed? could we not have pinpointed? could you not have pinpointed? could they not have pinpointed?
V-ing perfect
could I not have been pinpointing? could you not have been pinpointing? could he not have been pinpointing? could we not have been pinpointing? could you not have been pinpointing? could they not have been pinpointing?