can exercise
Regular verb: exercise - exercised- exercised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can exercise
you can exercise
she can exercise
we can exercise
you can exercise
they can exercise 	I can be exercising
you can be exercising
she can be exercising
we can be exercising
you can be exercising
they can be exercising	I can have exercised
you can have exercised
she can have exercised
we can have exercised
you can have exercised
they can have exercised	I can have been exercising
you can have been exercising
she can have been exercising
we can have been exercising
you can have been exercising
they can have been exercising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't exercise
you can't exercise
she can't exercise
we can't exercise
you can't exercise
they can't exercise 	I can't be exercising
you can't be exercising
she can't be exercising
we can't be exercising
you can't be exercising
they can't be exercising	I can't have exercised
you can't have exercised
she can't have exercised
we can't have exercised
you can't have exercised
they can't have exercised	I can't have been exercising
you can't have been exercising
she can't have been exercising
we can't have been exercising
you can't have been exercising
they can't have been exercising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I exercise?
can you exercise?
can she exercise?
can we exercise?
can you exercise?
can they exercise? 	can I be exercising?
can you be exercising?
can she be exercising?
can we be exercising?
can you be exercising?
can they be exercising? 	can I have exercised?
can you have exercised?
can she have exercised?
can we have exercised?
can you have exercised?
can they have exercised? 	can I have been exercising?
can you have been exercising?
can she have been exercising?
can we have been exercising?
can you have been exercising?
can they have been exercising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I exercise?
can't you exercise?
can't she exercise?
can't we exercise?
can't you exercise?
can't they exercise? 	can't I be exercising?
can't you be exercising?
can't she be exercising?
can't we be exercising?
can't you be exercising?
can't they be exercising? 	can't I have exercised?
can't you have exercised?
can't she have exercised?
can't we have exercised?
can't you have exercised?
can't they have exercised? 	can't I have been exercising?
can't you have been exercising?
can't she have been exercising?
can't we have been exercising?
can't you have been exercising?
can't they have been exercising?