I can perform you can perform he can perform we can perform you can perform they can perform
V-ing form
I can be performing you can be performing he can be performing we can be performing you can be performing they can be performing
Perfect
I can have performed you can have performed he can have performed we can have performed you can have performed they can have performed
V-ing perfect
I can have been performing you can have been performing he can have been performing we can have been performing you can have been performing they can have been performing
Negation
Simple form
I can't perform you can't perform he can't perform we can't perform you can't perform they can't perform
V-ing form
I can't be performing you can't be performing he can't be performing we can't be performing you can't be performing they can't be performing
Perfect
I can't have performed you can't have performed he can't have performed we can't have performed you can't have performed they can't have performed
V-ing perfect
I can't have been performing you can't have been performing he can't have been performing we can't have been performing you can't have been performing they can't have been performing
Interrogative form
Simple form
can I perform? can you perform? can he perform? can we perform? can you perform? can they perform?
V-ing form
can I be performing? can you be performing? can he be performing? can we be performing? can you be performing? can they be performing?
Perfect
can I have performed? can you have performed? can he have performed? can we have performed? can you have performed? can they have performed?
V-ing perfect
can I have been performing? can you have been performing? can he have been performing? can we have been performing? can you have been performing? can they have been performing?
Interro-negative form
Simple form
can't I perform? can't you perform? can't he perform? can't we perform? can't you perform? can't they perform?
V-ing form
can't I be performing? can't you be performing? can't he be performing? can't we be performing? can't you be performing? can't they be performing?
Perfect
can't I have performed? can't you have performed? can't he have performed? can't we have performed? can't you have performed? can't they have performed?
V-ing perfect
can't I have been performing? can't you have been performing? can't he have been performing? can't we have been performing? can't you have been performing? can't they have been performing?