English verb conjugation
CAN PIN

Regular verb: pin - pinned - pinned

Affirmation

Simple form	V-ing form
I can pin you can pin he can pin we can pin you can pin they can pin	I can be pinning you can be pinning he can be pinning we can be pinning you can be pinning they can be pinning
Perfect	V-ing perfect
I can have pinned you can have pinned he can have pinned we can have pinned you can have pinned they can have pinned	I can have been pinning you can have been pinning he can have been pinning we can have been pinning you can have been pinning they can have been pinning

Negation

Simple form	V-ing form
I cannot pin you cannot pin he cannot pin we cannot pin you cannot pin they cannot pin	I cannot be pinning you cannot be pinning he cannot be pinning we cannot be pinning you cannot be pinning they cannot be pinning
Perfect	V-ing perfect
I cannot have pinned you cannot have pinned he cannot have pinned we cannot have pinned you cannot have pinned they cannot have pinned	I cannot have been pinning you cannot have been pinning he cannot have been pinning we cannot have been pinning you cannot have been pinning they cannot have been pinning

Interrogative form

Simple form	V-ing form
can I pin? can you pin? can he pin? can we pin? can you pin? can they pin?	can I be pinning? can you be pinning? can he be pinning? can we be pinning? can you be pinning? can they be pinning?
Perfect	V-ing perfect
can I have pinned? can you have pinned? can he have pinned? can we have pinned? can you have pinned? can they have pinned?	can I have been pinning? can you have been pinning? can he have been pinning? can we have been pinning? can you have been pinning? can they have been pinning?

Interro-negative form

Simple form	V-ing form
can I not pin? can you not pin? can he not pin? can we not pin? can you not pin? can they not pin?	can I not be pinning? can you not be pinning? can he not be pinning? can we not be pinning? can you not be pinning? can they not be pinning?
Perfect	V-ing perfect
can I not have pinned? can you not have pinned? can he not have pinned? can we not have pinned? can you not have pinned? can they not have pinned?	can I not have been pinning? can you not have been pinning? can he not have been pinning? can we not have been pinning? can you not have been pinning? can they not have been pinning?