I can jump you can jump she can jump we can jump you can jump they can jump
V-ing form
I can be jumping you can be jumping she can be jumping we can be jumping you can be jumping they can be jumping
Perfect
I can have jumped you can have jumped she 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 she 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 she cannot jump we cannot jump you cannot jump they cannot jump
V-ing form
I cannot be jumping you cannot be jumping she cannot be jumping we cannot be jumping you cannot be jumping they cannot be jumping
Perfect
I cannot have jumped you cannot have jumped she 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 she 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 she jump? can we jump? can you jump? can they jump?
V-ing form
can I be jumping? can you be jumping? can she be jumping? can we be jumping? can you be jumping? can they be jumping?
Perfect
can I have jumped? can you have jumped? can she 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 she 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 she 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 she 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 she 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 she not have been jumping? can we not have been jumping? can you not have been jumping? can they not have been jumping?