could calcine
Regular verb: calcine - calcined- calcined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could calcine
you could calcine
he could calcine
we could calcine
you could calcine
they could calcine 	I could be calcining
you could be calcining
he could be calcining
we could be calcining
you could be calcining
they could be calcining	I could have calcined
you could have calcined
he could have calcined
we could have calcined
you could have calcined
they could have calcined	I could have been calcining
you could have been calcining
he could have been calcining
we could have been calcining
you could have been calcining
they could have been calcining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't calcine
you couldn't calcine
he couldn't calcine
we couldn't calcine
you couldn't calcine
they couldn't calcine 	I couldn't be calcining
you couldn't be calcining
he couldn't be calcining
we couldn't be calcining
you couldn't be calcining
they couldn't be calcining	I couldn't have calcined
you couldn't have calcined
he couldn't have calcined
we couldn't have calcined
you couldn't have calcined
they couldn't have calcined	I couldn't have been calcining
you couldn't have been calcining
he couldn't have been calcining
we couldn't have been calcining
you couldn't have been calcining
they couldn't have been calcining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calcine?
could you calcine?
could he calcine?
could we calcine?
could you calcine?
could they calcine? 	could I be calcining?
could you be calcining?
could he be calcining?
could we be calcining?
could you be calcining?
could they be calcining? 	could I have calcined?
could you have calcined?
could he have calcined?
could we have calcined?
could you have calcined?
could they have calcined? 	could I have been calcining?
could you have been calcining?
could he have been calcining?
could we have been calcining?
could you have been calcining?
could they have been calcining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I calcine?
couldn't you calcine?
couldn't he calcine?
couldn't we calcine?
couldn't you calcine?
couldn't they calcine? 	couldn't I be calcining?
couldn't you be calcining?
couldn't he be calcining?
couldn't we be calcining?
couldn't you be calcining?
couldn't they be calcining? 	couldn't I have calcined?
couldn't you have calcined?
couldn't he have calcined?
couldn't we have calcined?
couldn't you have calcined?
couldn't they have calcined? 	couldn't I have been calcining?
couldn't you have been calcining?
couldn't he have been calcining?
couldn't we have been calcining?
couldn't you have been calcining?
couldn't they have been calcining?