I can jump you can jump he can jump we can jump you can jump they can jump
V-ing form
I can be jumping you can be jumping he can be jumping we can be jumping you can be jumping they can be jumping
Perfect
I can have jumped you can have jumped he can have jumped we can have jumped you can have jumped they can have jumped
V-ing perfect
I can have been jumping you can have been jumping he can have been jumping we can have been jumping you can have been jumping they can have been jumping
Negation
Simple form
I cannot jump you cannot jump he cannot jump we cannot jump you cannot jump they cannot jump
V-ing form
I cannot be jumping you cannot be jumping he cannot be jumping we cannot be jumping you cannot be jumping they cannot be jumping
Perfect
I cannot have jumped you cannot have jumped he cannot have jumped we cannot have jumped you cannot have jumped they cannot have jumped
V-ing perfect
I cannot have been jumping you cannot have been jumping he cannot have been jumping we cannot have been jumping you cannot have been jumping they cannot have been jumping
Interrogative form
Simple form
can I jump? can you jump? can he jump? can we jump? can you jump? can they jump?
V-ing form
can I be jumping? can you be jumping? can he be jumping? can we be jumping? can you be jumping? can they be jumping?
Perfect
can I have jumped? can you have jumped? can he have jumped? can we have jumped? can you have jumped? can they have jumped?
V-ing perfect
can I have been jumping? can you have been jumping? can he have been jumping? can we have been jumping? can you have been jumping? can they have been jumping?
Interro-negative form
Simple form
can I not jump? can you not jump? can he not jump? can we not jump? can you not jump? can they not jump?
V-ing form
can I not be jumping? can you not be jumping? can he not be jumping? can we not be jumping? can you not be jumping? can they not be jumping?
Perfect
can I not have jumped? can you not have jumped? can he not have jumped? can we not have jumped? can you not have jumped? can they not have jumped?
V-ing perfect
can I not have been jumping? can you not have been jumping? can he not have been jumping? can we not have been jumping? can you not have been jumping? can they not have been jumping?