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 couldn't surfboard you couldn't surfboard he couldn't surfboard we couldn't surfboard you couldn't surfboard they couldn't surfboard	I couldn't be surfboarding you couldn't be surfboarding he couldn't be surfboarding we couldn't be surfboarding you couldn't be surfboarding they couldn't be surfboarding
Perfect	V-ing perfect
I couldn't have surfboarded you couldn't have surfboarded he couldn't have surfboarded we couldn't have surfboarded you couldn't have surfboarded they couldn't have surfboarded	I couldn't have been surfboarding you couldn't have been surfboarding he couldn't have been surfboarding we couldn't have been surfboarding you couldn't have been surfboarding they couldn't 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
couldn't I surfboard? couldn't you surfboard? couldn't he surfboard? couldn't we surfboard? couldn't you surfboard? couldn't they surfboard?	couldn't I be surfboarding? couldn't you be surfboarding? couldn't he be surfboarding? couldn't we be surfboarding? couldn't you be surfboarding? couldn't they be surfboarding?
Perfect	V-ing perfect
couldn't I have surfboarded? couldn't you have surfboarded? couldn't he have surfboarded? couldn't we have surfboarded? couldn't you have surfboarded? couldn't they have surfboarded?	couldn't I have been surfboarding? couldn't you have been surfboarding? couldn't he have been surfboarding? couldn't we have been surfboarding? couldn't you have been surfboarding? couldn't they have been surfboarding?