English verb conjugation
COULD STIPPLE

Regular verb: stipple - stippled - stippled

Affirmation

Simple form	V-ing form
I could stipple you could stipple she could stipple we could stipple you could stipple they could stipple	I could be stippling you could be stippling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she stipple? could we stipple? could you stipple? could they stipple?	could I be stippling? could you be stippling? could she 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 she 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 she 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 she 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 she 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 she 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 she have been stippling? couldn't we have been stippling? couldn't you have been stippling? couldn't they have been stippling?