I can telephone you can telephone he can telephone we can telephone you can telephone they can telephone
V-ing form
I can be telephoning you can be telephoning he can be telephoning we can be telephoning you can be telephoning they can be telephoning
Perfect
I can have telephoned you can have telephoned he can have telephoned we can have telephoned you can have telephoned they can have telephoned
V-ing perfect
I can have been telephoning you can have been telephoning he can have been telephoning we can have been telephoning you can have been telephoning they can have been telephoning
Negation
Simple form
I can't telephone you can't telephone he can't telephone we can't telephone you can't telephone they can't telephone
V-ing form
I can't be telephoning you can't be telephoning he can't be telephoning we can't be telephoning you can't be telephoning they can't be telephoning
Perfect
I can't have telephoned you can't have telephoned he can't have telephoned we can't have telephoned you can't have telephoned they can't have telephoned
V-ing perfect
I can't have been telephoning you can't have been telephoning he can't have been telephoning we can't have been telephoning you can't have been telephoning they can't have been telephoning
Interrogative form
Simple form
can I telephone? can you telephone? can he telephone? can we telephone? can you telephone? can they telephone?
V-ing form
can I be telephoning? can you be telephoning? can he be telephoning? can we be telephoning? can you be telephoning? can they be telephoning?
Perfect
can I have telephoned? can you have telephoned? can he have telephoned? can we have telephoned? can you have telephoned? can they have telephoned?
V-ing perfect
can I have been telephoning? can you have been telephoning? can he have been telephoning? can we have been telephoning? can you have been telephoning? can they have been telephoning?
Interro-negative form
Simple form
can't I telephone? can't you telephone? can't he telephone? can't we telephone? can't you telephone? can't they telephone?
V-ing form
can't I be telephoning? can't you be telephoning? can't he be telephoning? can't we be telephoning? can't you be telephoning? can't they be telephoning?
Perfect
can't I have telephoned? can't you have telephoned? can't he have telephoned? can't we have telephoned? can't you have telephoned? can't they have telephoned?
V-ing perfect
can't I have been telephoning? can't you have been telephoning? can't he have been telephoning? can't we have been telephoning? can't you have been telephoning? can't they have been telephoning?