could cachinnate cachinnate
Regular verb: cachinnate cachinnate - cachinnate cachinnated- cachinnate cachinnated

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cachinnate cachinnate
you could cachinnate cachinnate
she could cachinnate cachinnate
we could cachinnate cachinnate
you could cachinnate cachinnate
they could cachinnate cachinnate 	I could be cachinnate cachinnating
you could be cachinnate cachinnating
she could be cachinnate cachinnating
we could be cachinnate cachinnating
you could be cachinnate cachinnating
they could be cachinnate cachinnating	I could have cachinnate cachinnated
you could have cachinnate cachinnated
she could have cachinnate cachinnated
we could have cachinnate cachinnated
you could have cachinnate cachinnated
they could have cachinnate cachinnated	I could have been cachinnate cachinnating
you could have been cachinnate cachinnating
she could have been cachinnate cachinnating
we could have been cachinnate cachinnating
you could have been cachinnate cachinnating
they could have been cachinnate cachinnating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cachinnate cachinnate
you couldn't cachinnate cachinnate
she couldn't cachinnate cachinnate
we couldn't cachinnate cachinnate
you couldn't cachinnate cachinnate
they couldn't cachinnate cachinnate 	I couldn't be cachinnate cachinnating
you couldn't be cachinnate cachinnating
she couldn't be cachinnate cachinnating
we couldn't be cachinnate cachinnating
you couldn't be cachinnate cachinnating
they couldn't be cachinnate cachinnating	I couldn't have cachinnate cachinnated
you couldn't have cachinnate cachinnated
she couldn't have cachinnate cachinnated
we couldn't have cachinnate cachinnated
you couldn't have cachinnate cachinnated
they couldn't have cachinnate cachinnated	I couldn't have been cachinnate cachinnating
you couldn't have been cachinnate cachinnating
she couldn't have been cachinnate cachinnating
we couldn't have been cachinnate cachinnating
you couldn't have been cachinnate cachinnating
they couldn't have been cachinnate cachinnating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cachinnate cachinnate?
could you cachinnate cachinnate?
could she cachinnate cachinnate?
could we cachinnate cachinnate?
could you cachinnate cachinnate?
could they cachinnate cachinnate? 	could I be cachinnate cachinnating?
could you be cachinnate cachinnating?
could she be cachinnate cachinnating?
could we be cachinnate cachinnating?
could you be cachinnate cachinnating?
could they be cachinnate cachinnating? 	could I have cachinnate cachinnated?
could you have cachinnate cachinnated?
could she have cachinnate cachinnated?
could we have cachinnate cachinnated?
could you have cachinnate cachinnated?
could they have cachinnate cachinnated? 	could I have been cachinnate cachinnating?
could you have been cachinnate cachinnating?
could she have been cachinnate cachinnating?
could we have been cachinnate cachinnating?
could you have been cachinnate cachinnating?
could they have been cachinnate cachinnating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cachinnate cachinnate?
couldn't you cachinnate cachinnate?
couldn't she cachinnate cachinnate?
couldn't we cachinnate cachinnate?
couldn't you cachinnate cachinnate?
couldn't they cachinnate cachinnate? 	couldn't I be cachinnate cachinnating?
couldn't you be cachinnate cachinnating?
couldn't she be cachinnate cachinnating?
couldn't we be cachinnate cachinnating?
couldn't you be cachinnate cachinnating?
couldn't they be cachinnate cachinnating? 	couldn't I have cachinnate cachinnated?
couldn't you have cachinnate cachinnated?
couldn't she have cachinnate cachinnated?
couldn't we have cachinnate cachinnated?
couldn't you have cachinnate cachinnated?
couldn't they have cachinnate cachinnated? 	couldn't I have been cachinnate cachinnating?
couldn't you have been cachinnate cachinnating?
couldn't she have been cachinnate cachinnating?
couldn't we have been cachinnate cachinnating?
couldn't you have been cachinnate cachinnating?
couldn't they have been cachinnate cachinnating?