could cachinnate
Regular verb: cachinnate - cachinnated- cachinnated

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not cachinnate
you could not cachinnate
she could not cachinnate
we could not cachinnate
you could not cachinnate
they could not cachinnate 	I could not be cachinnating
you could not be cachinnating
she could not be cachinnating
we could not be cachinnating
you could not be cachinnating
they could not be cachinnating	I could not have cachinnated
you could not have cachinnated
she could not have cachinnated
we could not have cachinnated
you could not have cachinnated
they could not have cachinnated	I could not have been cachinnating
you could not have been cachinnating
she could not have been cachinnating
we could not have been cachinnating
you could not have been cachinnating
they could not have been cachinnating	

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

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