English verb conjugation
CAN PLANK

Regular verb: plank - planked - planked

Affirmation

Simple form	V-ing form
I can plank you can plank he can plank we can plank you can plank they can plank	I can be planking you can be planking he can be planking we can be planking you can be planking they can be planking
Perfect	V-ing perfect
I can have planked you can have planked he can have planked we can have planked you can have planked they can have planked	I can have been planking you can have been planking he can have been planking we can have been planking you can have been planking they can have been planking

Negation

Simple form	V-ing form
I cannot plank you cannot plank he cannot plank we cannot plank you cannot plank they cannot plank	I cannot be planking you cannot be planking he cannot be planking we cannot be planking you cannot be planking they cannot be planking
Perfect	V-ing perfect
I cannot have planked you cannot have planked he cannot have planked we cannot have planked you cannot have planked they cannot have planked	I cannot have been planking you cannot have been planking he cannot have been planking we cannot have been planking you cannot have been planking they cannot have been planking

Interrogative form

Simple form	V-ing form
can I plank? can you plank? can he plank? can we plank? can you plank? can they plank?	can I be planking? can you be planking? can he be planking? can we be planking? can you be planking? can they be planking?
Perfect	V-ing perfect
can I have planked? can you have planked? can he have planked? can we have planked? can you have planked? can they have planked?	can I have been planking? can you have been planking? can he have been planking? can we have been planking? can you have been planking? can they have been planking?

Interro-negative form

Simple form	V-ing form
can I not plank? can you not plank? can he not plank? can we not plank? can you not plank? can they not plank?	can I not be planking? can you not be planking? can he not be planking? can we not be planking? can you not be planking? can they not be planking?
Perfect	V-ing perfect
can I not have planked? can you not have planked? can he not have planked? can we not have planked? can you not have planked? can they not have planked?	can I not have been planking? can you not have been planking? can he not have been planking? can we not have been planking? can you not have been planking? can they not have been planking?