could stipple
Regular verb: stipple - stippled- stippled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?