I can ring you can ring she can ring we can ring you can ring they can ring
V-ing form
I can be ringing you can be ringing she can be ringing we can be ringing you can be ringing they can be ringing
Perfect
I can have rung you can have rung she can have rung we can have rung you can have rung they can have rung
V-ing perfect
I can have been ringing you can have been ringing she can have been ringing we can have been ringing you can have been ringing they can have been ringing
Negation
Simple form
I can't ring you can't ring she can't ring we can't ring you can't ring they can't ring
V-ing form
I can't be ringing you can't be ringing she can't be ringing we can't be ringing you can't be ringing they can't be ringing
Perfect
I can't have rung you can't have rung she can't have rung we can't have rung you can't have rung they can't have rung
V-ing perfect
I can't have been ringing you can't have been ringing she can't have been ringing we can't have been ringing you can't have been ringing they can't have been ringing
Interrogative form
Simple form
can I ring? can you ring? can she ring? can we ring? can you ring? can they ring?
V-ing form
can I be ringing? can you be ringing? can she be ringing? can we be ringing? can you be ringing? can they be ringing?
Perfect
can I have rung? can you have rung? can she have rung? can we have rung? can you have rung? can they have rung?
V-ing perfect
can I have been ringing? can you have been ringing? can she have been ringing? can we have been ringing? can you have been ringing? can they have been ringing?
Interro-negative form
Simple form
can't I ring? can't you ring? can't she ring? can't we ring? can't you ring? can't they ring?
V-ing form
can't I be ringing? can't you be ringing? can't she be ringing? can't we be ringing? can't you be ringing? can't they be ringing?
Perfect
can't I have rung? can't you have rung? can't she have rung? can't we have rung? can't you have rung? can't they have rung?
V-ing perfect
can't I have been ringing? can't you have been ringing? can't she have been ringing? can't we have been ringing? can't you have been ringing? can't they have been ringing?