could caliper
Regular verb: caliper - calipered- calipered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could caliper
you could caliper
she could caliper
we could caliper
you could caliper
they could caliper 	I could be calipering
you could be calipering
she could be calipering
we could be calipering
you could be calipering
they could be calipering	I could have calipered
you could have calipered
she could have calipered
we could have calipered
you could have calipered
they could have calipered	I could have been calipering
you could have been calipering
she could have been calipering
we could have been calipering
you could have been calipering
they could have been calipering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't caliper
you couldn't caliper
she couldn't caliper
we couldn't caliper
you couldn't caliper
they couldn't caliper 	I couldn't be calipering
you couldn't be calipering
she couldn't be calipering
we couldn't be calipering
you couldn't be calipering
they couldn't be calipering	I couldn't have calipered
you couldn't have calipered
she couldn't have calipered
we couldn't have calipered
you couldn't have calipered
they couldn't have calipered	I couldn't have been calipering
you couldn't have been calipering
she couldn't have been calipering
we couldn't have been calipering
you couldn't have been calipering
they couldn't have been calipering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I caliper?
could you caliper?
could she caliper?
could we caliper?
could you caliper?
could they caliper? 	could I be calipering?
could you be calipering?
could she be calipering?
could we be calipering?
could you be calipering?
could they be calipering? 	could I have calipered?
could you have calipered?
could she have calipered?
could we have calipered?
could you have calipered?
could they have calipered? 	could I have been calipering?
could you have been calipering?
could she have been calipering?
could we have been calipering?
could you have been calipering?
could they have been calipering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I caliper?
couldn't you caliper?
couldn't she caliper?
couldn't we caliper?
couldn't you caliper?
couldn't they caliper? 	couldn't I be calipering?
couldn't you be calipering?
couldn't she be calipering?
couldn't we be calipering?
couldn't you be calipering?
couldn't they be calipering? 	couldn't I have calipered?
couldn't you have calipered?
couldn't she have calipered?
couldn't we have calipered?
couldn't you have calipered?
couldn't they have calipered? 	couldn't I have been calipering?
couldn't you have been calipering?
couldn't she have been calipering?
couldn't we have been calipering?
couldn't you have been calipering?
couldn't they have been calipering?