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 cannot elaborate you cannot elaborate he cannot elaborate we cannot elaborate you cannot elaborate they cannot elaborate
V-ing form
I cannot be elaborating you cannot be elaborating he cannot be elaborating we cannot be elaborating you cannot be elaborating they cannot be elaborating
Perfect
I cannot have elaborated you cannot have elaborated he cannot have elaborated we cannot have elaborated you cannot have elaborated they cannot have elaborated
V-ing perfect
I cannot have been elaborating you cannot have been elaborating he cannot have been elaborating we cannot have been elaborating you cannot have been elaborating they cannot 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 I not elaborate? can you not elaborate? can he not elaborate? can we not elaborate? can you not elaborate? can they not elaborate?
V-ing form
can I not be elaborating? can you not be elaborating? can he not be elaborating? can we not be elaborating? can you not be elaborating? can they not be elaborating?
Perfect
can I not have elaborated? can you not have elaborated? can he not have elaborated? can we not have elaborated? can you not have elaborated? can they not have elaborated?
V-ing perfect
can I not have been elaborating? can you not have been elaborating? can he not have been elaborating? can we not have been elaborating? can you not have been elaborating? can they not have been elaborating?