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 couldn't stipple you couldn't stipple he couldn't stipple we couldn't stipple you couldn't stipple they couldn't stipple	I couldn't be stippling you couldn't be stippling he couldn't be stippling we couldn't be stippling you couldn't be stippling they couldn't be stippling
Perfect	V-ing perfect
I couldn't have stippled you couldn't have stippled he couldn't have stippled we couldn't have stippled you couldn't have stippled they couldn't have stippled	I couldn't have been stippling you couldn't have been stippling he couldn't have been stippling we couldn't have been stippling you couldn't have been stippling they couldn't 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
couldn't I stipple? couldn't you stipple? couldn't he stipple? couldn't we stipple? couldn't you stipple? couldn't they stipple?	couldn't I be stippling? couldn't you be stippling? couldn't he be stippling? couldn't we be stippling? couldn't you be stippling? couldn't they be stippling?
Perfect	V-ing perfect
couldn't I have stippled? couldn't you have stippled? couldn't he have stippled? couldn't we have stippled? couldn't you have stippled? couldn't they have stippled?	couldn't I have been stippling? couldn't you have been stippling? couldn't he have been stippling? couldn't we have been stippling? couldn't you have been stippling? couldn't they have been stippling?