English verb conjugation
COULD BIKE

Regular verb: bike - biked - biked

Affirmation

Simple form	V-ing form
I could bike you could bike he could bike we could bike you could bike they could bike	I could be biking you could be biking he could be biking we could be biking you could be biking they could be biking
Perfect	V-ing perfect
I could have biked you could have biked he could have biked we could have biked you could have biked they could have biked	I could have been biking you could have been biking he could have been biking we could have been biking you could have been biking they could have been biking

Negation

Simple form	V-ing form
I couldn't bike you couldn't bike he couldn't bike we couldn't bike you couldn't bike they couldn't bike	I couldn't be biking you couldn't be biking he couldn't be biking we couldn't be biking you couldn't be biking they couldn't be biking
Perfect	V-ing perfect
I couldn't have biked you couldn't have biked he couldn't have biked we couldn't have biked you couldn't have biked they couldn't have biked	I couldn't have been biking you couldn't have been biking he couldn't have been biking we couldn't have been biking you couldn't have been biking they couldn't have been biking

Interrogative form

Simple form	V-ing form
could I bike? could you bike? could he bike? could we bike? could you bike? could they bike?	could I be biking? could you be biking? could he be biking? could we be biking? could you be biking? could they be biking?
Perfect	V-ing perfect
could I have biked? could you have biked? could he have biked? could we have biked? could you have biked? could they have biked?	could I have been biking? could you have been biking? could he have been biking? could we have been biking? could you have been biking? could they have been biking?

Interro-negative form

Simple form	V-ing form
couldn't I bike? couldn't you bike? couldn't he bike? couldn't we bike? couldn't you bike? couldn't they bike?	couldn't I be biking? couldn't you be biking? couldn't he be biking? couldn't we be biking? couldn't you be biking? couldn't they be biking?
Perfect	V-ing perfect
couldn't I have biked? couldn't you have biked? couldn't he have biked? couldn't we have biked? couldn't you have biked? couldn't they have biked?	couldn't I have been biking? couldn't you have been biking? couldn't he have been biking? couldn't we have been biking? couldn't you have been biking? couldn't they have been biking?