I can ring you can ring he can ring we can ring you can ring they can ring
V-ing form
I can be ringing you can be ringing he can be ringing we can be ringing you can be ringing they can be ringing
Perfect
I can have rung you can have rung he 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 he 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 he 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 he 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 he 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 he 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 he ring? can we ring? can you ring? can they ring?
V-ing form
can I be ringing? can you be ringing? can he be ringing? can we be ringing? can you be ringing? can they be ringing?
Perfect
can I have rung? can you have rung? can he 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 he 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 he 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 he 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 he 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 he have been ringing? can't we have been ringing? can't you have been ringing? can't they have been ringing?