I could enjoy you could enjoy he could enjoy we could enjoy you could enjoy they could enjoy
V-ing form
I could be enjoying you could be enjoying he could be enjoying we could be enjoying you could be enjoying they could be enjoying
Perfect
I could have enjoyed you could have enjoyed he could have enjoyed we could have enjoyed you could have enjoyed they could have enjoyed
V-ing perfect
I could have been enjoying you could have been enjoying he could have been enjoying we could have been enjoying you could have been enjoying they could have been enjoying
Negation
Simple form
I couldn't enjoy you couldn't enjoy he couldn't enjoy we couldn't enjoy you couldn't enjoy they couldn't enjoy
V-ing form
I couldn't be enjoying you couldn't be enjoying he couldn't be enjoying we couldn't be enjoying you couldn't be enjoying they couldn't be enjoying
Perfect
I couldn't have enjoyed you couldn't have enjoyed he couldn't have enjoyed we couldn't have enjoyed you couldn't have enjoyed they couldn't have enjoyed
V-ing perfect
I couldn't have been enjoying you couldn't have been enjoying he couldn't have been enjoying we couldn't have been enjoying you couldn't have been enjoying they couldn't have been enjoying
Interrogative form
Simple form
could I enjoy? could you enjoy? could he enjoy? could we enjoy? could you enjoy? could they enjoy?
V-ing form
could I be enjoying? could you be enjoying? could he be enjoying? could we be enjoying? could you be enjoying? could they be enjoying?
Perfect
could I have enjoyed? could you have enjoyed? could he have enjoyed? could we have enjoyed? could you have enjoyed? could they have enjoyed?
V-ing perfect
could I have been enjoying? could you have been enjoying? could he have been enjoying? could we have been enjoying? could you have been enjoying? could they have been enjoying?
Interro-negative form
Simple form
couldn't I enjoy? couldn't you enjoy? couldn't he enjoy? couldn't we enjoy? couldn't you enjoy? couldn't they enjoy?
V-ing form
couldn't I be enjoying? couldn't you be enjoying? couldn't he be enjoying? couldn't we be enjoying? couldn't you be enjoying? couldn't they be enjoying?
Perfect
couldn't I have enjoyed? couldn't you have enjoyed? couldn't he have enjoyed? couldn't we have enjoyed? couldn't you have enjoyed? couldn't they have enjoyed?
V-ing perfect
couldn't I have been enjoying? couldn't you have been enjoying? couldn't he have been enjoying? couldn't we have been enjoying? couldn't you have been enjoying? couldn't they have been enjoying?