English verb conjugation
COULD SPIKE

Regular verb: spike - spiked - spiked

Affirmation

Simple form	V-ing form
I could spike you could spike he could spike we could spike you could spike they could spike	I could be spiking you could be spiking he could be spiking we could be spiking you could be spiking they could be spiking
Perfect	V-ing perfect
I could have spiked you could have spiked he could have spiked we could have spiked you could have spiked they could have spiked	I could have been spiking you could have been spiking he could have been spiking we could have been spiking you could have been spiking they could have been spiking

Negation

Simple form	V-ing form
I couldn't spike you couldn't spike he couldn't spike we couldn't spike you couldn't spike they couldn't spike	I couldn't be spiking you couldn't be spiking he couldn't be spiking we couldn't be spiking you couldn't be spiking they couldn't be spiking
Perfect	V-ing perfect
I couldn't have spiked you couldn't have spiked he couldn't have spiked we couldn't have spiked you couldn't have spiked they couldn't have spiked	I couldn't have been spiking you couldn't have been spiking he couldn't have been spiking we couldn't have been spiking you couldn't have been spiking they couldn't have been spiking

Interrogative form

Simple form	V-ing form
could I spike? could you spike? could he spike? could we spike? could you spike? could they spike?	could I be spiking? could you be spiking? could he be spiking? could we be spiking? could you be spiking? could they be spiking?
Perfect	V-ing perfect
could I have spiked? could you have spiked? could he have spiked? could we have spiked? could you have spiked? could they have spiked?	could I have been spiking? could you have been spiking? could he have been spiking? could we have been spiking? could you have been spiking? could they have been spiking?

Interro-negative form

Simple form	V-ing form
couldn't I spike? couldn't you spike? couldn't he spike? couldn't we spike? couldn't you spike? couldn't they spike?	couldn't I be spiking? couldn't you be spiking? couldn't he be spiking? couldn't we be spiking? couldn't you be spiking? couldn't they be spiking?
Perfect	V-ing perfect
couldn't I have spiked? couldn't you have spiked? couldn't he have spiked? couldn't we have spiked? couldn't you have spiked? couldn't they have spiked?	couldn't I have been spiking? couldn't you have been spiking? couldn't he have been spiking? couldn't we have been spiking? couldn't you have been spiking? couldn't they have been spiking?