I can retire you can retire he can retire we can retire you can retire they can retire
V-ing form
I can be retiring you can be retiring he can be retiring we can be retiring you can be retiring they can be retiring
Perfect
I can have retired you can have retired he can have retired we can have retired you can have retired they can have retired
V-ing perfect
I can have been retiring you can have been retiring he can have been retiring we can have been retiring you can have been retiring they can have been retiring
Negation
Simple form
I can't retire you can't retire he can't retire we can't retire you can't retire they can't retire
V-ing form
I can't be retiring you can't be retiring he can't be retiring we can't be retiring you can't be retiring they can't be retiring
Perfect
I can't have retired you can't have retired he can't have retired we can't have retired you can't have retired they can't have retired
V-ing perfect
I can't have been retiring you can't have been retiring he can't have been retiring we can't have been retiring you can't have been retiring they can't have been retiring
Interrogative form
Simple form
can I retire? can you retire? can he retire? can we retire? can you retire? can they retire?
V-ing form
can I be retiring? can you be retiring? can he be retiring? can we be retiring? can you be retiring? can they be retiring?
Perfect
can I have retired? can you have retired? can he have retired? can we have retired? can you have retired? can they have retired?
V-ing perfect
can I have been retiring? can you have been retiring? can he have been retiring? can we have been retiring? can you have been retiring? can they have been retiring?
Interro-negative form
Simple form
can't I retire? can't you retire? can't he retire? can't we retire? can't you retire? can't they retire?
V-ing form
can't I be retiring? can't you be retiring? can't he be retiring? can't we be retiring? can't you be retiring? can't they be retiring?
Perfect
can't I have retired? can't you have retired? can't he have retired? can't we have retired? can't you have retired? can't they have retired?
V-ing perfect
can't I have been retiring? can't you have been retiring? can't he have been retiring? can't we have been retiring? can't you have been retiring? can't they have been retiring?