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 cannot retire you cannot retire she cannot retire we cannot retire you cannot retire they cannot retire
V-ing form
I cannot be retiring you cannot be retiring she cannot be retiring we cannot be retiring you cannot be retiring they cannot be retiring
Perfect
I cannot have retired you cannot have retired she cannot have retired we cannot have retired you cannot have retired they cannot have retired
V-ing perfect
I cannot have been retiring you cannot have been retiring she cannot have been retiring we cannot have been retiring you cannot have been retiring they cannot 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 I not retire? can you not retire? can she not retire? can we not retire? can you not retire? can they not retire?
V-ing form
can I not be retiring? can you not be retiring? can she not be retiring? can we not be retiring? can you not be retiring? can they not be retiring?
Perfect
can I not have retired? can you not have retired? can she not have retired? can we not have retired? can you not have retired? can they not have retired?
V-ing perfect
can I not have been retiring? can you not have been retiring? can she not have been retiring? can we not have been retiring? can you not have been retiring? can they not have been retiring?