could sparkle
Regular verb: sparkle - sparkled- sparkled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sparkle
you could sparkle
she could sparkle
we could sparkle
you could sparkle
they could sparkle 	I could be sparkling
you could be sparkling
she could be sparkling
we could be sparkling
you could be sparkling
they could be sparkling	I could have sparkled
you could have sparkled
she could have sparkled
we could have sparkled
you could have sparkled
they could have sparkled	I could have been sparkling
you could have been sparkling
she could have been sparkling
we could have been sparkling
you could have been sparkling
they could have been sparkling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sparkle
you couldn't sparkle
she couldn't sparkle
we couldn't sparkle
you couldn't sparkle
they couldn't sparkle 	I couldn't be sparkling
you couldn't be sparkling
she couldn't be sparkling
we couldn't be sparkling
you couldn't be sparkling
they couldn't be sparkling	I couldn't have sparkled
you couldn't have sparkled
she couldn't have sparkled
we couldn't have sparkled
you couldn't have sparkled
they couldn't have sparkled	I couldn't have been sparkling
you couldn't have been sparkling
she couldn't have been sparkling
we couldn't have been sparkling
you couldn't have been sparkling
they couldn't have been sparkling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sparkle?
could you sparkle?
could she sparkle?
could we sparkle?
could you sparkle?
could they sparkle? 	could I be sparkling?
could you be sparkling?
could she be sparkling?
could we be sparkling?
could you be sparkling?
could they be sparkling? 	could I have sparkled?
could you have sparkled?
could she have sparkled?
could we have sparkled?
could you have sparkled?
could they have sparkled? 	could I have been sparkling?
could you have been sparkling?
could she have been sparkling?
could we have been sparkling?
could you have been sparkling?
could they have been sparkling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sparkle?
couldn't you sparkle?
couldn't she sparkle?
couldn't we sparkle?
couldn't you sparkle?
couldn't they sparkle? 	couldn't I be sparkling?
couldn't you be sparkling?
couldn't she be sparkling?
couldn't we be sparkling?
couldn't you be sparkling?
couldn't they be sparkling? 	couldn't I have sparkled?
couldn't you have sparkled?
couldn't she have sparkled?
couldn't we have sparkled?
couldn't you have sparkled?
couldn't they have sparkled? 	couldn't I have been sparkling?
couldn't you have been sparkling?
couldn't she have been sparkling?
couldn't we have been sparkling?
couldn't you have been sparkling?
couldn't they have been sparkling?