can vary
Regular verb: vary - varied- varied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can vary
you can vary
she can vary
we can vary
you can vary
they can vary 	I can be varying
you can be varying
she can be varying
we can be varying
you can be varying
they can be varying	I can have varied
you can have varied
she can have varied
we can have varied
you can have varied
they can have varied	I can have been varying
you can have been varying
she can have been varying
we can have been varying
you can have been varying
they can have been varying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot vary
you cannot vary
she cannot vary
we cannot vary
you cannot vary
they cannot vary 	I cannot be varying
you cannot be varying
she cannot be varying
we cannot be varying
you cannot be varying
they cannot be varying	I cannot have varied
you cannot have varied
she cannot have varied
we cannot have varied
you cannot have varied
they cannot have varied	I cannot have been varying
you cannot have been varying
she cannot have been varying
we cannot have been varying
you cannot have been varying
they cannot have been varying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I vary?
can you vary?
can she vary?
can we vary?
can you vary?
can they vary? 	can I be varying?
can you be varying?
can she be varying?
can we be varying?
can you be varying?
can they be varying? 	can I have varied?
can you have varied?
can she have varied?
can we have varied?
can you have varied?
can they have varied? 	can I have been varying?
can you have been varying?
can she have been varying?
can we have been varying?
can you have been varying?
can they have been varying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not vary?
can you not vary?
can she not vary?
can we not vary?
can you not vary?
can they not vary? 	can I not be varying?
can you not be varying?
can she not be varying?
can we not be varying?
can you not be varying?
can they not be varying? 	can I not have varied?
can you not have varied?
can she not have varied?
can we not have varied?
can you not have varied?
can they not have varied? 	can I not have been varying?
can you not have been varying?
can she not have been varying?
can we not have been varying?
can you not have been varying?
can they not have been varying?