could calve
Regular verb: calve - calved- calved

Affirmation 	
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I could calve
you could calve
she could calve
we could calve
you could calve
they could calve 	I could be calving
you could be calving
she could be calving
we could be calving
you could be calving
they could be calving	I could have calved
you could have calved
she could have calved
we could have calved
you could have calved
they could have calved	I could have been calving
you could have been calving
she could have been calving
we could have been calving
you could have been calving
they could have been calving	

Negation 	
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I couldn't calve
you couldn't calve
she couldn't calve
we couldn't calve
you couldn't calve
they couldn't calve 	I couldn't be calving
you couldn't be calving
she couldn't be calving
we couldn't be calving
you couldn't be calving
they couldn't be calving	I couldn't have calved
you couldn't have calved
she couldn't have calved
we couldn't have calved
you couldn't have calved
they couldn't have calved	I couldn't have been calving
you couldn't have been calving
she couldn't have been calving
we couldn't have been calving
you couldn't have been calving
they couldn't have been calving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calve?
could you calve?
could she calve?
could we calve?
could you calve?
could they calve? 	could I be calving?
could you be calving?
could she be calving?
could we be calving?
could you be calving?
could they be calving? 	could I have calved?
could you have calved?
could she have calved?
could we have calved?
could you have calved?
could they have calved? 	could I have been calving?
could you have been calving?
could she have been calving?
could we have been calving?
could you have been calving?
could they have been calving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I calve?
couldn't you calve?
couldn't she calve?
couldn't we calve?
couldn't you calve?
couldn't they calve? 	couldn't I be calving?
couldn't you be calving?
couldn't she be calving?
couldn't we be calving?
couldn't you be calving?
couldn't they be calving? 	couldn't I have calved?
couldn't you have calved?
couldn't she have calved?
couldn't we have calved?
couldn't you have calved?
couldn't they have calved? 	couldn't I have been calving?
couldn't you have been calving?
couldn't she have been calving?
couldn't we have been calving?
couldn't you have been calving?
couldn't they have been calving?