could calm
Regular verb: calm - calmed- calmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could calm
you could calm
she could calm
we could calm
you could calm
they could calm 	I could be calming
you could be calming
she could be calming
we could be calming
you could be calming
they could be calming	I could have calmed
you could have calmed
she could have calmed
we could have calmed
you could have calmed
they could have calmed	I could have been calming
you could have been calming
she could have been calming
we could have been calming
you could have been calming
they could have been calming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't calm
you couldn't calm
she couldn't calm
we couldn't calm
you couldn't calm
they couldn't calm 	I couldn't be calming
you couldn't be calming
she couldn't be calming
we couldn't be calming
you couldn't be calming
they couldn't be calming	I couldn't have calmed
you couldn't have calmed
she couldn't have calmed
we couldn't have calmed
you couldn't have calmed
they couldn't have calmed	I couldn't have been calming
you couldn't have been calming
she couldn't have been calming
we couldn't have been calming
you couldn't have been calming
they couldn't have been calming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I calm?
could you calm?
could she calm?
could we calm?
could you calm?
could they calm? 	could I be calming?
could you be calming?
could she be calming?
could we be calming?
could you be calming?
could they be calming? 	could I have calmed?
could you have calmed?
could she have calmed?
could we have calmed?
could you have calmed?
could they have calmed? 	could I have been calming?
could you have been calming?
could she have been calming?
could we have been calming?
could you have been calming?
could they have been calming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I calm?
couldn't you calm?
couldn't she calm?
couldn't we calm?
couldn't you calm?
couldn't they calm? 	couldn't I be calming?
couldn't you be calming?
couldn't she be calming?
couldn't we be calming?
couldn't you be calming?
couldn't they be calming? 	couldn't I have calmed?
couldn't you have calmed?
couldn't she have calmed?
couldn't we have calmed?
couldn't you have calmed?
couldn't they have calmed? 	couldn't I have been calming?
couldn't you have been calming?
couldn't she have been calming?
couldn't we have been calming?
couldn't you have been calming?
couldn't they have been calming?