can improve
Regular verb: improve - improved- improved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can improve
you can improve
she can improve
we can improve
you can improve
they can improve 	I can be improving
you can be improving
she can be improving
we can be improving
you can be improving
they can be improving	I can have improved
you can have improved
she can have improved
we can have improved
you can have improved
they can have improved	I can have been improving
you can have been improving
she can have been improving
we can have been improving
you can have been improving
they can have been improving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot improve
you cannot improve
she cannot improve
we cannot improve
you cannot improve
they cannot improve 	I cannot be improving
you cannot be improving
she cannot be improving
we cannot be improving
you cannot be improving
they cannot be improving	I cannot have improved
you cannot have improved
she cannot have improved
we cannot have improved
you cannot have improved
they cannot have improved	I cannot have been improving
you cannot have been improving
she cannot have been improving
we cannot have been improving
you cannot have been improving
they cannot have been improving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I improve?
can you improve?
can she improve?
can we improve?
can you improve?
can they improve? 	can I be improving?
can you be improving?
can she be improving?
can we be improving?
can you be improving?
can they be improving? 	can I have improved?
can you have improved?
can she have improved?
can we have improved?
can you have improved?
can they have improved? 	can I have been improving?
can you have been improving?
can she have been improving?
can we have been improving?
can you have been improving?
can they have been improving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not improve?
can you not improve?
can she not improve?
can we not improve?
can you not improve?
can they not improve? 	can I not be improving?
can you not be improving?
can she not be improving?
can we not be improving?
can you not be improving?
can they not be improving? 	can I not have improved?
can you not have improved?
can she not have improved?
can we not have improved?
can you not have improved?
can they not have improved? 	can I not have been improving?
can you not have been improving?
can she not have been improving?
can we not have been improving?
can you not have been improving?
can they not have been improving?