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 can't decide you can't decide he can't decide we can't decide you can't decide they can't decide
V-ing form
I can't be deciding you can't be deciding he can't be deciding we can't be deciding you can't be deciding they can't be deciding
Perfect
I can't have decided you can't have decided he can't have decided we can't have decided you can't have decided they can't have decided
V-ing perfect
I can't have been deciding you can't have been deciding he can't have been deciding we can't have been deciding you can't have been deciding they can't 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't I decide? can't you decide? can't he decide? can't we decide? can't you decide? can't they decide?
V-ing form
can't I be deciding? can't you be deciding? can't he be deciding? can't we be deciding? can't you be deciding? can't they be deciding?
Perfect
can't I have decided? can't you have decided? can't he have decided? can't we have decided? can't you have decided? can't they have decided?
V-ing perfect
can't I have been deciding? can't you have been deciding? can't he have been deciding? can't we have been deciding? can't you have been deciding? can't they have been deciding?