English verb conjugation
CAN PERFORM

Regular verb: perform - performed - performed

Affirmation

Simple form	V-ing form
I can perform you can perform he can perform we can perform you can perform they can perform	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	V-ing 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	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	V-ing form
I cannot perform you cannot perform he cannot perform we cannot perform you cannot perform they cannot perform	I cannot be performing you cannot be performing he cannot be performing we cannot be performing you cannot be performing they cannot be performing
Perfect	V-ing perfect
I cannot have performed you cannot have performed he cannot have performed we cannot have performed you cannot have performed they cannot have performed	I cannot have been performing you cannot have been performing he cannot have been performing we cannot have been performing you cannot have been performing they cannot have been performing

Interrogative form

Simple form	V-ing form
can I perform? can you perform? can he perform? can we perform? can you perform? can they perform?	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	V-ing 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?	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	V-ing form
can I not perform? can you not perform? can he not perform? can we not perform? can you not perform? can they not perform?	can I not be performing? can you not be performing? can he not be performing? can we not be performing? can you not be performing? can they not be performing?
Perfect	V-ing perfect
can I not have performed? can you not have performed? can he not have performed? can we not have performed? can you not have performed? can they not have performed?	can I not have been performing? can you not have been performing? can he not have been performing? can we not have been performing? can you not have been performing? can they not have been performing?