English verb conjugation
COULD SURFBOARD

Regular verb: surfboard - surfboarded - surfboarded

Affirmation

Simple form	V-ing form
I could surfboard you could surfboard he could surfboard we could surfboard you could surfboard they could surfboard	I could be surfboarding you could be surfboarding he could be surfboarding we could be surfboarding you could be surfboarding they could be surfboarding
Perfect	V-ing perfect
I could have surfboarded you could have surfboarded he could have surfboarded we could have surfboarded you could have surfboarded they could have surfboarded	I could have been surfboarding you could have been surfboarding he could have been surfboarding we could have been surfboarding you could have been surfboarding they could have been surfboarding

Negation

Simple form	V-ing form
I could not surfboard you could not surfboard he could not surfboard we could not surfboard you could not surfboard they could not surfboard	I could not be surfboarding you could not be surfboarding he could not be surfboarding we could not be surfboarding you could not be surfboarding they could not be surfboarding
Perfect	V-ing perfect
I could not have surfboarded you could not have surfboarded he could not have surfboarded we could not have surfboarded you could not have surfboarded they could not have surfboarded	I could not have been surfboarding you could not have been surfboarding he could not have been surfboarding we could not have been surfboarding you could not have been surfboarding they could not have been surfboarding

Interrogative form

Simple form	V-ing form
could I surfboard? could you surfboard? could he surfboard? could we surfboard? could you surfboard? could they surfboard?	could I be surfboarding? could you be surfboarding? could he be surfboarding? could we be surfboarding? could you be surfboarding? could they be surfboarding?
Perfect	V-ing perfect
could I have surfboarded? could you have surfboarded? could he have surfboarded? could we have surfboarded? could you have surfboarded? could they have surfboarded?	could I have been surfboarding? could you have been surfboarding? could he have been surfboarding? could we have been surfboarding? could you have been surfboarding? could they have been surfboarding?

Interro-negative form

Simple form	V-ing form
could I not surfboard? could you not surfboard? could he not surfboard? could we not surfboard? could you not surfboard? could they not surfboard?	could I not be surfboarding? could you not be surfboarding? could he not be surfboarding? could we not be surfboarding? could you not be surfboarding? could they not be surfboarding?
Perfect	V-ing perfect
could I not have surfboarded? could you not have surfboarded? could he not have surfboarded? could we not have surfboarded? could you not have surfboarded? could they not have surfboarded?	could I not have been surfboarding? could you not have been surfboarding? could he not have been surfboarding? could we not have been surfboarding? could you not have been surfboarding? could they not have been surfboarding?