I can retire you can retire she can retire we can retire you can retire they can retire
V-ing form
I can be retiring you can be retiring she can be retiring we can be retiring you can be retiring they can be retiring
Perfect
I can have retired you can have retired she 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 she 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 she 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 she 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 she 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 she 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 she retire? can we retire? can you retire? can they retire?
V-ing form
can I be retiring? can you be retiring? can she be retiring? can we be retiring? can you be retiring? can they be retiring?
Perfect
can I have retired? can you have retired? can she 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 she 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 she 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 she 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 she 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 she have been retiring? can't we have been retiring? can't you have been retiring? can't they have been retiring?