I can dig you can dig he can dig we can dig you can dig they can dig
V-ing form
I can be digging you can be digging he can be digging we can be digging you can be digging they can be digging
Perfect
I can have dug you can have dug he can have dug we can have dug you can have dug they can have dug
V-ing perfect
I can have been digging you can have been digging he can have been digging we can have been digging you can have been digging they can have been digging
Negation
Simple form
I cannot dig you cannot dig he cannot dig we cannot dig you cannot dig they cannot dig
V-ing form
I cannot be digging you cannot be digging he cannot be digging we cannot be digging you cannot be digging they cannot be digging
Perfect
I cannot have dug you cannot have dug he cannot have dug we cannot have dug you cannot have dug they cannot have dug
V-ing perfect
I cannot have been digging you cannot have been digging he cannot have been digging we cannot have been digging you cannot have been digging they cannot have been digging
Interrogative form
Simple form
can I dig? can you dig? can he dig? can we dig? can you dig? can they dig?
V-ing form
can I be digging? can you be digging? can he be digging? can we be digging? can you be digging? can they be digging?
Perfect
can I have dug? can you have dug? can he have dug? can we have dug? can you have dug? can they have dug?
V-ing perfect
can I have been digging? can you have been digging? can he have been digging? can we have been digging? can you have been digging? can they have been digging?
Interro-negative form
Simple form
can I not dig? can you not dig? can he not dig? can we not dig? can you not dig? can they not dig?
V-ing form
can I not be digging? can you not be digging? can he not be digging? can we not be digging? can you not be digging? can they not be digging?
Perfect
can I not have dug? can you not have dug? can he not have dug? can we not have dug? can you not have dug? can they not have dug?
V-ing perfect
can I not have been digging? can you not have been digging? can he not have been digging? can we not have been digging? can you not have been digging? can they not have been digging?