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 can't plank you can't plank he can't plank we can't plank you can't plank they can't plank	I can't be planking you can't be planking he can't be planking we can't be planking you can't be planking they can't be planking
Perfect	V-ing perfect
I can't have planked you can't have planked he can't have planked we can't have planked you can't have planked they can't have planked	I can't have been planking you can't have been planking he can't have been planking we can't have been planking you can't have been planking they can't 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't I plank? can't you plank? can't he plank? can't we plank? can't you plank? can't they plank?	can't I be planking? can't you be planking? can't he be planking? can't we be planking? can't you be planking? can't they be planking?
Perfect	V-ing perfect
can't I have planked? can't you have planked? can't he have planked? can't we have planked? can't you have planked? can't they have planked?	can't I have been planking? can't you have been planking? can't he have been planking? can't we have been planking? can't you have been planking? can't they have been planking?