I can decide you can decide he can decide we can decide you can decide they can decide
V-ing form
I can be deciding you can be deciding he can be deciding we can be deciding you can be deciding they can be deciding
Perfect
I can have decided you can have decided he can have decided we can have decided you can have decided they can have decided
V-ing perfect
I can have been deciding you can have been deciding he can have been deciding we can have been deciding you can have been deciding they can have been deciding
Negation
Simple form
I cannot decide you cannot decide he cannot decide we cannot decide you cannot decide they cannot decide
V-ing form
I cannot be deciding you cannot be deciding he cannot be deciding we cannot be deciding you cannot be deciding they cannot be deciding
Perfect
I cannot have decided you cannot have decided he cannot have decided we cannot have decided you cannot have decided they cannot have decided
V-ing perfect
I cannot have been deciding you cannot have been deciding he cannot have been deciding we cannot have been deciding you cannot have been deciding they cannot have been deciding
Interrogative form
Simple form
can I decide? can you decide? can he decide? can we decide? can you decide? can they decide?
V-ing form
can I be deciding? can you be deciding? can he be deciding? can we be deciding? can you be deciding? can they be deciding?
Perfect
can I have decided? can you have decided? can he have decided? can we have decided? can you have decided? can they have decided?
V-ing perfect
can I have been deciding? can you have been deciding? can he have been deciding? can we have been deciding? can you have been deciding? can they have been deciding?
Interro-negative form
Simple form
can I not decide? can you not decide? can he not decide? can we not decide? can you not decide? can they not decide?
V-ing form
can I not be deciding? can you not be deciding? can he not be deciding? can we not be deciding? can you not be deciding? can they not be deciding?
Perfect
can I not have decided? can you not have decided? can he not have decided? can we not have decided? can you not have decided? can they not have decided?
V-ing perfect
can I not have been deciding? can you not have been deciding? can he not have been deciding? can we not have been deciding? can you not have been deciding? can they not have been deciding?