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 couldn't cuckoo you couldn't cuckoo he couldn't cuckoo we couldn't cuckoo you couldn't cuckoo they couldn't cuckoo	I couldn't be cuckooing you couldn't be cuckooing he couldn't be cuckooing we couldn't be cuckooing you couldn't be cuckooing they couldn't be cuckooing
Perfect	V-ing perfect
I couldn't have cuckooed you couldn't have cuckooed he couldn't have cuckooed we couldn't have cuckooed you couldn't have cuckooed they couldn't have cuckooed	I couldn't have been cuckooing you couldn't have been cuckooing he couldn't have been cuckooing we couldn't have been cuckooing you couldn't have been cuckooing they couldn't 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
couldn't I cuckoo? couldn't you cuckoo? couldn't he cuckoo? couldn't we cuckoo? couldn't you cuckoo? couldn't they cuckoo?	couldn't I be cuckooing? couldn't you be cuckooing? couldn't he be cuckooing? couldn't we be cuckooing? couldn't you be cuckooing? couldn't they be cuckooing?
Perfect	V-ing perfect
couldn't I have cuckooed? couldn't you have cuckooed? couldn't he have cuckooed? couldn't we have cuckooed? couldn't you have cuckooed? couldn't they have cuckooed?	couldn't I have been cuckooing? couldn't you have been cuckooing? couldn't he have been cuckooing? couldn't we have been cuckooing? couldn't you have been cuckooing? couldn't they have been cuckooing?