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 could not tailspin you could not tailspin he could not tailspin we could not tailspin you could not tailspin they could not tailspin	I could not be tailspining you could not be tailspining he could not be tailspining we could not be tailspining you could not be tailspining they could not be tailspining
Perfect	V-ing perfect
I could not have tailspined you could not have tailspined he could not have tailspined we could not have tailspined you could not have tailspined they could not have tailspined	I could not have been tailspining you could not have been tailspining he could not have been tailspining we could not have been tailspining you could not have been tailspining they could not 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
could I not tailspin? could you not tailspin? could he not tailspin? could we not tailspin? could you not tailspin? could they not tailspin?	could I not be tailspining? could you not be tailspining? could he not be tailspining? could we not be tailspining? could you not be tailspining? could they not be tailspining?
Perfect	V-ing perfect
could I not have tailspined? could you not have tailspined? could he not have tailspined? could we not have tailspined? could you not have tailspined? could they not have tailspined?	could I not have been tailspining? could you not have been tailspining? could he not have been tailspining? could we not have been tailspining? could you not have been tailspining? could they not have been tailspining?