could calendar
Regular verb: calendar - calendared- calendared

Affirmation 	
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I could calendar
you could calendar
he could calendar
we could calendar
you could calendar
they could calendar 	I could be calendaring
you could be calendaring
he could be calendaring
we could be calendaring
you could be calendaring
they could be calendaring	I could have calendared
you could have calendared
he could have calendared
we could have calendared
you could have calendared
they could have calendared	I could have been calendaring
you could have been calendaring
he could have been calendaring
we could have been calendaring
you could have been calendaring
they could have been calendaring	

Negation 	
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I couldn't calendar
you couldn't calendar
he couldn't calendar
we couldn't calendar
you couldn't calendar
they couldn't calendar 	I couldn't be calendaring
you couldn't be calendaring
he couldn't be calendaring
we couldn't be calendaring
you couldn't be calendaring
they couldn't be calendaring	I couldn't have calendared
you couldn't have calendared
he couldn't have calendared
we couldn't have calendared
you couldn't have calendared
they couldn't have calendared	I couldn't have been calendaring
you couldn't have been calendaring
he couldn't have been calendaring
we couldn't have been calendaring
you couldn't have been calendaring
they couldn't have been calendaring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calendar?
could you calendar?
could he calendar?
could we calendar?
could you calendar?
could they calendar? 	could I be calendaring?
could you be calendaring?
could he be calendaring?
could we be calendaring?
could you be calendaring?
could they be calendaring? 	could I have calendared?
could you have calendared?
could he have calendared?
could we have calendared?
could you have calendared?
could they have calendared? 	could I have been calendaring?
could you have been calendaring?
could he have been calendaring?
could we have been calendaring?
could you have been calendaring?
could they have been calendaring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I calendar?
couldn't you calendar?
couldn't he calendar?
couldn't we calendar?
couldn't you calendar?
couldn't they calendar? 	couldn't I be calendaring?
couldn't you be calendaring?
couldn't he be calendaring?
couldn't we be calendaring?
couldn't you be calendaring?
couldn't they be calendaring? 	couldn't I have calendared?
couldn't you have calendared?
couldn't he have calendared?
couldn't we have calendared?
couldn't you have calendared?
couldn't they have calendared? 	couldn't I have been calendaring?
couldn't you have been calendaring?
couldn't he have been calendaring?
couldn't we have been calendaring?
couldn't you have been calendaring?
couldn't they have been calendaring?