I can elaborate you can elaborate he can elaborate we can elaborate you can elaborate they can elaborate
V-ing form
I can be elaborating you can be elaborating he can be elaborating we can be elaborating you can be elaborating they can be elaborating
Perfect
I can have elaborated you can have elaborated he can have elaborated we can have elaborated you can have elaborated they can have elaborated
V-ing perfect
I can have been elaborating you can have been elaborating he can have been elaborating we can have been elaborating you can have been elaborating they can have been elaborating
Negation
Simple form
I can't elaborate you can't elaborate he can't elaborate we can't elaborate you can't elaborate they can't elaborate
V-ing form
I can't be elaborating you can't be elaborating he can't be elaborating we can't be elaborating you can't be elaborating they can't be elaborating
Perfect
I can't have elaborated you can't have elaborated he can't have elaborated we can't have elaborated you can't have elaborated they can't have elaborated
V-ing perfect
I can't have been elaborating you can't have been elaborating he can't have been elaborating we can't have been elaborating you can't have been elaborating they can't have been elaborating
Interrogative form
Simple form
can I elaborate? can you elaborate? can he elaborate? can we elaborate? can you elaborate? can they elaborate?
V-ing form
can I be elaborating? can you be elaborating? can he be elaborating? can we be elaborating? can you be elaborating? can they be elaborating?
Perfect
can I have elaborated? can you have elaborated? can he have elaborated? can we have elaborated? can you have elaborated? can they have elaborated?
V-ing perfect
can I have been elaborating? can you have been elaborating? can he have been elaborating? can we have been elaborating? can you have been elaborating? can they have been elaborating?
Interro-negative form
Simple form
can't I elaborate? can't you elaborate? can't he elaborate? can't we elaborate? can't you elaborate? can't they elaborate?
V-ing form
can't I be elaborating? can't you be elaborating? can't he be elaborating? can't we be elaborating? can't you be elaborating? can't they be elaborating?
Perfect
can't I have elaborated? can't you have elaborated? can't he have elaborated? can't we have elaborated? can't you have elaborated? can't they have elaborated?
V-ing perfect
can't I have been elaborating? can't you have been elaborating? can't he have been elaborating? can't we have been elaborating? can't you have been elaborating? can't they have been elaborating?