English verb conjugation
CAN VARY

Regular verb: vary - varied - varied

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I can't vary you can't vary she can't vary we can't vary you can't vary they can't vary	I can't be varying you can't be varying she can't be varying we can't be varying you can't be varying they can't be varying
Perfect	V-ing perfect
I can't have varied you can't have varied she can't have varied we can't have varied you can't have varied they can't have varied	I can't have been varying you can't have been varying she can't have been varying we can't have been varying you can't have been varying they can't have been varying

Interrogative form

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