I can choose you can choose he can choose we can choose you can choose they can choose
V-ing form
I can be choosing you can be choosing he can be choosing we can be choosing you can be choosing they can be choosing
Perfect
I can have chosen you can have chosen he can have chosen we can have chosen you can have chosen they can have chosen
V-ing perfect
I can have been choosing you can have been choosing he can have been choosing we can have been choosing you can have been choosing they can have been choosing
Negation
Simple form
I can't choose you can't choose he can't choose we can't choose you can't choose they can't choose
V-ing form
I can't be choosing you can't be choosing he can't be choosing we can't be choosing you can't be choosing they can't be choosing
Perfect
I can't have chosen you can't have chosen he can't have chosen we can't have chosen you can't have chosen they can't have chosen
V-ing perfect
I can't have been choosing you can't have been choosing he can't have been choosing we can't have been choosing you can't have been choosing they can't have been choosing
Interrogative form
Simple form
can I choose? can you choose? can he choose? can we choose? can you choose? can they choose?
V-ing form
can I be choosing? can you be choosing? can he be choosing? can we be choosing? can you be choosing? can they be choosing?
Perfect
can I have chosen? can you have chosen? can he have chosen? can we have chosen? can you have chosen? can they have chosen?
V-ing perfect
can I have been choosing? can you have been choosing? can he have been choosing? can we have been choosing? can you have been choosing? can they have been choosing?
Interro-negative form
Simple form
can't I choose? can't you choose? can't he choose? can't we choose? can't you choose? can't they choose?
V-ing form
can't I be choosing? can't you be choosing? can't he be choosing? can't we be choosing? can't you be choosing? can't they be choosing?
Perfect
can't I have chosen? can't you have chosen? can't he have chosen? can't we have chosen? can't you have chosen? can't they have chosen?
V-ing perfect
can't I have been choosing? can't you have been choosing? can't he have been choosing? can't we have been choosing? can't you have been choosing? can't they have been choosing?