I can vary you can vary he can vary we can vary you can vary they can vary
Forme en V-ing
I can be varying you can be varying he can be varying we can be varying you can be varying they can be varying
Perfect
I can have varied you can have varied he can have varied we can have varied you can have varied they can have varied
Perfect en V-ing
I can have been varying you can have been varying he can have been varying we can have been varying you can have been varying they can have been varying
Négation
Forme simple
I cannot vary you cannot vary he cannot vary we cannot vary you cannot vary they cannot vary
Forme en V-ing
I cannot be varying you cannot be varying he cannot be varying we cannot be varying you cannot be varying they cannot be varying
Perfect
I cannot have varied you cannot have varied he cannot have varied we cannot have varied you cannot have varied they cannot have varied
Perfect en V-ing
I cannot have been varying you cannot have been varying he cannot have been varying we cannot have been varying you cannot have been varying they cannot have been varying
Forme interrogative
Forme simple
can I vary? can you vary? can he vary? can we vary? can you vary? can they vary?
Forme en V-ing
can I be varying? can you be varying? can he be varying? can we be varying? can you be varying? can they be varying?
Perfect
can I have varied? can you have varied? can he have varied? can we have varied? can you have varied? can they have varied?
Perfect en V-ing
can I have been varying? can you have been varying? can he have been varying? can we have been varying? can you have been varying? can they have been varying?
Forme interro-négative
Forme simple
can I not vary? can you not vary? can he not vary? can we not vary? can you not vary? can they not vary?
Forme en V-ing
can I not be varying? can you not be varying? can he not be varying? can we not be varying? can you not be varying? can they not be varying?
Perfect
can I not have varied? can you not have varied? can he not have varied? can we not have varied? can you not have varied? can they not have varied?
Perfect en V-ing
can I not have been varying? can you not have been varying? can he not have been varying? can we not have been varying? can you not have been varying? can they not have been varying?