can exert
Regular verb: exert - exerted- exerted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can exert
you can exert
she can exert
we can exert
you can exert
they can exert 	I can be exerting
you can be exerting
she can be exerting
we can be exerting
you can be exerting
they can be exerting	I can have exerted
you can have exerted
she can have exerted
we can have exerted
you can have exerted
they can have exerted	I can have been exerting
you can have been exerting
she can have been exerting
we can have been exerting
you can have been exerting
they can have been exerting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot exert
you cannot exert
she cannot exert
we cannot exert
you cannot exert
they cannot exert 	I cannot be exerting
you cannot be exerting
she cannot be exerting
we cannot be exerting
you cannot be exerting
they cannot be exerting	I cannot have exerted
you cannot have exerted
she cannot have exerted
we cannot have exerted
you cannot have exerted
they cannot have exerted	I cannot have been exerting
you cannot have been exerting
she cannot have been exerting
we cannot have been exerting
you cannot have been exerting
they cannot have been exerting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I exert?
can you exert?
can she exert?
can we exert?
can you exert?
can they exert? 	can I be exerting?
can you be exerting?
can she be exerting?
can we be exerting?
can you be exerting?
can they be exerting? 	can I have exerted?
can you have exerted?
can she have exerted?
can we have exerted?
can you have exerted?
can they have exerted? 	can I have been exerting?
can you have been exerting?
can she have been exerting?
can we have been exerting?
can you have been exerting?
can they have been exerting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not exert?
can you not exert?
can she not exert?
can we not exert?
can you not exert?
can they not exert? 	can I not be exerting?
can you not be exerting?
can she not be exerting?
can we not be exerting?
can you not be exerting?
can they not be exerting? 	can I not have exerted?
can you not have exerted?
can she not have exerted?
can we not have exerted?
can you not have exerted?
can they not have exerted? 	can I not have been exerting?
can you not have been exerting?
can she not have been exerting?
can we not have been exerting?
can you not have been exerting?
can they not have been exerting?