could calcify
Regular verb: calcify - calcified- calcified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could calcify
you could calcify
she could calcify
we could calcify
you could calcify
they could calcify 	I could be calcifying
you could be calcifying
she could be calcifying
we could be calcifying
you could be calcifying
they could be calcifying	I could have calcified
you could have calcified
she 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
she 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 couldn't calcify
you couldn't calcify
she couldn't calcify
we couldn't calcify
you couldn't calcify
they couldn't calcify 	I couldn't be calcifying
you couldn't be calcifying
she couldn't be calcifying
we couldn't be calcifying
you couldn't be calcifying
they couldn't be calcifying	I couldn't have calcified
you couldn't have calcified
she couldn't have calcified
we couldn't have calcified
you couldn't have calcified
they couldn't have calcified	I couldn't have been calcifying
you couldn't have been calcifying
she couldn't have been calcifying
we couldn't have been calcifying
you couldn't have been calcifying
they couldn't have been calcifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calcify?
could you calcify?
could she calcify?
could we calcify?
could you calcify?
could they calcify? 	could I be calcifying?
could you be calcifying?
could she be calcifying?
could we be calcifying?
could you be calcifying?
could they be calcifying? 	could I have calcified?
could you have calcified?
could she 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 she 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 	
couldn't I calcify?
couldn't you calcify?
couldn't she calcify?
couldn't we calcify?
couldn't you calcify?
couldn't they calcify? 	couldn't I be calcifying?
couldn't you be calcifying?
couldn't she be calcifying?
couldn't we be calcifying?
couldn't you be calcifying?
couldn't they be calcifying? 	couldn't I have calcified?
couldn't you have calcified?
couldn't she have calcified?
couldn't we have calcified?
couldn't you have calcified?
couldn't they have calcified? 	couldn't I have been calcifying?
couldn't you have been calcifying?
couldn't she have been calcifying?
couldn't we have been calcifying?
couldn't you have been calcifying?
couldn't they have been calcifying?