English verb conjugation
COULD CUCKOO

Regular verb: cuckoo - cuckooed - cuckooed

Affirmation

Simple form	V-ing form
I could cuckoo you could cuckoo he could cuckoo we could cuckoo you could cuckoo they could cuckoo	I could be cuckooing you could be cuckooing he could be cuckooing we could be cuckooing you could be cuckooing they could be cuckooing
Perfect	V-ing perfect
I could have cuckooed you could have cuckooed he could have cuckooed we could have cuckooed you could have cuckooed they could have cuckooed	I could have been cuckooing you could have been cuckooing he could have been cuckooing we could have been cuckooing you could have been cuckooing they could have been cuckooing

Negation

Simple form	V-ing form
I could not cuckoo you could not cuckoo he could not cuckoo we could not cuckoo you could not cuckoo they could not cuckoo	I could not be cuckooing you could not be cuckooing he could not be cuckooing we could not be cuckooing you could not be cuckooing they could not be cuckooing
Perfect	V-ing perfect
I could not have cuckooed you could not have cuckooed he could not have cuckooed we could not have cuckooed you could not have cuckooed they could not have cuckooed	I could not have been cuckooing you could not have been cuckooing he could not have been cuckooing we could not have been cuckooing you could not have been cuckooing they could not have been cuckooing

Interrogative form

Simple form	V-ing form
could I cuckoo? could you cuckoo? could he cuckoo? could we cuckoo? could you cuckoo? could they cuckoo?	could I be cuckooing? could you be cuckooing? could he be cuckooing? could we be cuckooing? could you be cuckooing? could they be cuckooing?
Perfect	V-ing perfect
could I have cuckooed? could you have cuckooed? could he have cuckooed? could we have cuckooed? could you have cuckooed? could they have cuckooed?	could I have been cuckooing? could you have been cuckooing? could he have been cuckooing? could we have been cuckooing? could you have been cuckooing? could they have been cuckooing?

Interro-negative form

Simple form	V-ing form
could I not cuckoo? could you not cuckoo? could he not cuckoo? could we not cuckoo? could you not cuckoo? could they not cuckoo?	could I not be cuckooing? could you not be cuckooing? could he not be cuckooing? could we not be cuckooing? could you not be cuckooing? could they not be cuckooing?
Perfect	V-ing perfect
could I not have cuckooed? could you not have cuckooed? could he not have cuckooed? could we not have cuckooed? could you not have cuckooed? could they not have cuckooed?	could I not have been cuckooing? could you not have been cuckooing? could he not have been cuckooing? could we not have been cuckooing? could you not have been cuckooing? could they not have been cuckooing?