I can marble you can marble he can marble we can marble you can marble they can marble
V-ing form
I can be marbling you can be marbling he can be marbling we can be marbling you can be marbling they can be marbling
Perfect
I can have marbled you can have marbled he can have marbled we can have marbled you can have marbled they can have marbled
V-ing perfect
I can have been marbling you can have been marbling he can have been marbling we can have been marbling you can have been marbling they can have been marbling
Negation
Simple form
I cannot marble you cannot marble he cannot marble we cannot marble you cannot marble they cannot marble
V-ing form
I cannot be marbling you cannot be marbling he cannot be marbling we cannot be marbling you cannot be marbling they cannot be marbling
Perfect
I cannot have marbled you cannot have marbled he cannot have marbled we cannot have marbled you cannot have marbled they cannot have marbled
V-ing perfect
I cannot have been marbling you cannot have been marbling he cannot have been marbling we cannot have been marbling you cannot have been marbling they cannot have been marbling
Interrogative form
Simple form
can I marble? can you marble? can he marble? can we marble? can you marble? can they marble?
V-ing form
can I be marbling? can you be marbling? can he be marbling? can we be marbling? can you be marbling? can they be marbling?
Perfect
can I have marbled? can you have marbled? can he have marbled? can we have marbled? can you have marbled? can they have marbled?
V-ing perfect
can I have been marbling? can you have been marbling? can he have been marbling? can we have been marbling? can you have been marbling? can they have been marbling?
Interro-negative form
Simple form
can I not marble? can you not marble? can he not marble? can we not marble? can you not marble? can they not marble?
V-ing form
can I not be marbling? can you not be marbling? can he not be marbling? can we not be marbling? can you not be marbling? can they not be marbling?
Perfect
can I not have marbled? can you not have marbled? can he not have marbled? can we not have marbled? can you not have marbled? can they not have marbled?
V-ing perfect
can I not have been marbling? can you not have been marbling? can he not have been marbling? can we not have been marbling? can you not have been marbling? can they not have been marbling?