English verb conjugation
COULD SHARK

Regular verb: shark - sharked - sharked

Affirmation

Simple form	V-ing form
I could shark you could shark he could shark we could shark you could shark they could shark	I could be sharking you could be sharking he could be sharking we could be sharking you could be sharking they could be sharking
Perfect	V-ing perfect
I could have sharked you could have sharked he could have sharked we could have sharked you could have sharked they could have sharked	I could have been sharking you could have been sharking he could have been sharking we could have been sharking you could have been sharking they could have been sharking

Negation

Simple form	V-ing form
I couldn't shark you couldn't shark he couldn't shark we couldn't shark you couldn't shark they couldn't shark	I couldn't be sharking you couldn't be sharking he couldn't be sharking we couldn't be sharking you couldn't be sharking they couldn't be sharking
Perfect	V-ing perfect
I couldn't have sharked you couldn't have sharked he couldn't have sharked we couldn't have sharked you couldn't have sharked they couldn't have sharked	I couldn't have been sharking you couldn't have been sharking he couldn't have been sharking we couldn't have been sharking you couldn't have been sharking they couldn't have been sharking

Interrogative form

Simple form	V-ing form
could I shark? could you shark? could he shark? could we shark? could you shark? could they shark?	could I be sharking? could you be sharking? could he be sharking? could we be sharking? could you be sharking? could they be sharking?
Perfect	V-ing perfect
could I have sharked? could you have sharked? could he have sharked? could we have sharked? could you have sharked? could they have sharked?	could I have been sharking? could you have been sharking? could he have been sharking? could we have been sharking? could you have been sharking? could they have been sharking?

Interro-negative form

Simple form	V-ing form
couldn't I shark? couldn't you shark? couldn't he shark? couldn't we shark? couldn't you shark? couldn't they shark?	couldn't I be sharking? couldn't you be sharking? couldn't he be sharking? couldn't we be sharking? couldn't you be sharking? couldn't they be sharking?
Perfect	V-ing perfect
couldn't I have sharked? couldn't you have sharked? couldn't he have sharked? couldn't we have sharked? couldn't you have sharked? couldn't they have sharked?	couldn't I have been sharking? couldn't you have been sharking? couldn't he have been sharking? couldn't we have been sharking? couldn't you have been sharking? couldn't they have been sharking?