I can digest you can digest he can digest we can digest you can digest they can digest
V-ing form
I can be digesting you can be digesting he can be digesting we can be digesting you can be digesting they can be digesting
Perfect
I can have digested you can have digested he can have digested we can have digested you can have digested they can have digested
V-ing perfect
I can have been digesting you can have been digesting he can have been digesting we can have been digesting you can have been digesting they can have been digesting
Negation
Simple form
I cannot digest you cannot digest he cannot digest we cannot digest you cannot digest they cannot digest
V-ing form
I cannot be digesting you cannot be digesting he cannot be digesting we cannot be digesting you cannot be digesting they cannot be digesting
Perfect
I cannot have digested you cannot have digested he cannot have digested we cannot have digested you cannot have digested they cannot have digested
V-ing perfect
I cannot have been digesting you cannot have been digesting he cannot have been digesting we cannot have been digesting you cannot have been digesting they cannot have been digesting
Interrogative form
Simple form
can I digest? can you digest? can he digest? can we digest? can you digest? can they digest?
V-ing form
can I be digesting? can you be digesting? can he be digesting? can we be digesting? can you be digesting? can they be digesting?
Perfect
can I have digested? can you have digested? can he have digested? can we have digested? can you have digested? can they have digested?
V-ing perfect
can I have been digesting? can you have been digesting? can he have been digesting? can we have been digesting? can you have been digesting? can they have been digesting?
Interro-negative form
Simple form
can I not digest? can you not digest? can he not digest? can we not digest? can you not digest? can they not digest?
V-ing form
can I not be digesting? can you not be digesting? can he not be digesting? can we not be digesting? can you not be digesting? can they not be digesting?
Perfect
can I not have digested? can you not have digested? can he not have digested? can we not have digested? can you not have digested? can they not have digested?
V-ing perfect
can I not have been digesting? can you not have been digesting? can he not have been digesting? can we not have been digesting? can you not have been digesting? can they not have been digesting?