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