could calcify
Regular verb: calcify - calcified- calcified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could calcify
you could calcify
he could calcify
we could calcify
you could calcify
they could calcify 	I could be calcifying
you could be calcifying
he could be calcifying
we could be calcifying
you could be calcifying
they could be calcifying	I could have calcified
you could have calcified
he could have calcified
we could have calcified
you could have calcified
they could have calcified	I could have been calcifying
you could have been calcifying
he could have been calcifying
we could have been calcifying
you could have been calcifying
they could have been calcifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not calcify
you could not calcify
he could not calcify
we could not calcify
you could not calcify
they could not calcify 	I could not be calcifying
you could not be calcifying
he could not be calcifying
we could not be calcifying
you could not be calcifying
they could not be calcifying	I could not have calcified
you could not have calcified
he could not have calcified
we could not have calcified
you could not have calcified
they could not have calcified	I could not have been calcifying
you could not have been calcifying
he could not have been calcifying
we could not have been calcifying
you could not have been calcifying
they could not have been calcifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calcify?
could you calcify?
could he calcify?
could we calcify?
could you calcify?
could they calcify? 	could I be calcifying?
could you be calcifying?
could he be calcifying?
could we be calcifying?
could you be calcifying?
could they be calcifying? 	could I have calcified?
could you have calcified?
could he have calcified?
could we have calcified?
could you have calcified?
could they have calcified? 	could I have been calcifying?
could you have been calcifying?
could he have been calcifying?
could we have been calcifying?
could you have been calcifying?
could they have been calcifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not calcify?
could you not calcify?
could he not calcify?
could we not calcify?
could you not calcify?
could they not calcify? 	could I not be calcifying?
could you not be calcifying?
could he not be calcifying?
could we not be calcifying?
could you not be calcifying?
could they not be calcifying? 	could I not have calcified?
could you not have calcified?
could he not have calcified?
could we not have calcified?
could you not have calcified?
could they not have calcified? 	could I not have been calcifying?
could you not have been calcifying?
could he not have been calcifying?
could we not have been calcifying?
could you not have been calcifying?
could they not have been calcifying?