English verb conjugation
COULD TAILSPIN

Regular verb: tailspin - tailspined - tailspined

Affirmation

Simple form	V-ing form
I could tailspin you could tailspin he could tailspin we could tailspin you could tailspin they could tailspin	I could be tailspining you could be tailspining he could be tailspining we could be tailspining you could be tailspining they could be tailspining
Perfect	V-ing perfect
I could have tailspined you could have tailspined he could have tailspined we could have tailspined you could have tailspined they could have tailspined	I could have been tailspining you could have been tailspining he could have been tailspining we could have been tailspining you could have been tailspining they could have been tailspining

Negation

Simple form	V-ing form
I couldn't tailspin you couldn't tailspin he couldn't tailspin we couldn't tailspin you couldn't tailspin they couldn't tailspin	I couldn't be tailspining you couldn't be tailspining he couldn't be tailspining we couldn't be tailspining you couldn't be tailspining they couldn't be tailspining
Perfect	V-ing perfect
I couldn't have tailspined you couldn't have tailspined he couldn't have tailspined we couldn't have tailspined you couldn't have tailspined they couldn't have tailspined	I couldn't have been tailspining you couldn't have been tailspining he couldn't have been tailspining we couldn't have been tailspining you couldn't have been tailspining they couldn't have been tailspining

Interrogative form

Simple form	V-ing form
could I tailspin? could you tailspin? could he tailspin? could we tailspin? could you tailspin? could they tailspin?	could I be tailspining? could you be tailspining? could he be tailspining? could we be tailspining? could you be tailspining? could they be tailspining?
Perfect	V-ing perfect
could I have tailspined? could you have tailspined? could he have tailspined? could we have tailspined? could you have tailspined? could they have tailspined?	could I have been tailspining? could you have been tailspining? could he have been tailspining? could we have been tailspining? could you have been tailspining? could they have been tailspining?

Interro-negative form

Simple form	V-ing form
couldn't I tailspin? couldn't you tailspin? couldn't he tailspin? couldn't we tailspin? couldn't you tailspin? couldn't they tailspin?	couldn't I be tailspining? couldn't you be tailspining? couldn't he be tailspining? couldn't we be tailspining? couldn't you be tailspining? couldn't they be tailspining?
Perfect	V-ing perfect
couldn't I have tailspined? couldn't you have tailspined? couldn't he have tailspined? couldn't we have tailspined? couldn't you have tailspined? couldn't they have tailspined?	couldn't I have been tailspining? couldn't you have been tailspining? couldn't he have been tailspining? couldn't we have been tailspining? couldn't you have been tailspining? couldn't they have been tailspining?