English verb conjugation
COULD STIPPLE

Regular verb: stipple - stippled - stippled

Affirmation

Simple form	V-ing form
I could stipple you could stipple he could stipple we could stipple you could stipple they could stipple	I could be stippling you could be stippling he could be stippling we could be stippling you could be stippling they could be stippling
Perfect	V-ing perfect
I could have stippled you could have stippled he could have stippled we could have stippled you could have stippled they could have stippled	I could have been stippling you could have been stippling he could have been stippling we could have been stippling you could have been stippling they could have been stippling

Negation

Simple form	V-ing form
I could not stipple you could not stipple he could not stipple we could not stipple you could not stipple they could not stipple	I could not be stippling you could not be stippling he could not be stippling we could not be stippling you could not be stippling they could not be stippling
Perfect	V-ing perfect
I could not have stippled you could not have stippled he could not have stippled we could not have stippled you could not have stippled they could not have stippled	I could not have been stippling you could not have been stippling he could not have been stippling we could not have been stippling you could not have been stippling they could not have been stippling

Interrogative form

Simple form	V-ing form
could I stipple? could you stipple? could he stipple? could we stipple? could you stipple? could they stipple?	could I be stippling? could you be stippling? could he be stippling? could we be stippling? could you be stippling? could they be stippling?
Perfect	V-ing perfect
could I have stippled? could you have stippled? could he have stippled? could we have stippled? could you have stippled? could they have stippled?	could I have been stippling? could you have been stippling? could he have been stippling? could we have been stippling? could you have been stippling? could they have been stippling?

Interro-negative form

Simple form	V-ing form
could I not stipple? could you not stipple? could he not stipple? could we not stipple? could you not stipple? could they not stipple?	could I not be stippling? could you not be stippling? could he not be stippling? could we not be stippling? could you not be stippling? could they not be stippling?
Perfect	V-ing perfect
could I not have stippled? could you not have stippled? could he not have stippled? could we not have stippled? could you not have stippled? could they not have stippled?	could I not have been stippling? could you not have been stippling? could he not have been stippling? could we not have been stippling? could you not have been stippling? could they not have been stippling?