English verb conjugation
COULD PINPOINT

Regular verb: pinpoint - pinpointed - pinpointed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing 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	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
I could not pinpoint you could not pinpoint he could not pinpoint we could not pinpoint you could not pinpoint they could not pinpoint	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	V-ing 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	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	V-ing form
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?
Perfect	V-ing 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?	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
could I not pinpoint? could you not pinpoint? could he not pinpoint? could we not pinpoint? could you not pinpoint? could they not pinpoint?	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	V-ing 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?	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?