I can perdure you can perdure he can perdure we can perdure you can perdure they can perdure
V-ing form
I can be perduring you can be perduring he can be perduring we can be perduring you can be perduring they can be perduring
Perfect
I can have perdured you can have perdured he can have perdured we can have perdured you can have perdured they can have perdured
V-ing perfect
I can have been perduring you can have been perduring he can have been perduring we can have been perduring you can have been perduring they can have been perduring
Negation
Simple form
I can't perdure you can't perdure he can't perdure we can't perdure you can't perdure they can't perdure
V-ing form
I can't be perduring you can't be perduring he can't be perduring we can't be perduring you can't be perduring they can't be perduring
Perfect
I can't have perdured you can't have perdured he can't have perdured we can't have perdured you can't have perdured they can't have perdured
V-ing perfect
I can't have been perduring you can't have been perduring he can't have been perduring we can't have been perduring you can't have been perduring they can't have been perduring
Interrogative form
Simple form
can I perdure? can you perdure? can he perdure? can we perdure? can you perdure? can they perdure?
V-ing form
can I be perduring? can you be perduring? can he be perduring? can we be perduring? can you be perduring? can they be perduring?
Perfect
can I have perdured? can you have perdured? can he have perdured? can we have perdured? can you have perdured? can they have perdured?
V-ing perfect
can I have been perduring? can you have been perduring? can he have been perduring? can we have been perduring? can you have been perduring? can they have been perduring?
Interro-negative form
Simple form
can't I perdure? can't you perdure? can't he perdure? can't we perdure? can't you perdure? can't they perdure?
V-ing form
can't I be perduring? can't you be perduring? can't he be perduring? can't we be perduring? can't you be perduring? can't they be perduring?
Perfect
can't I have perdured? can't you have perdured? can't he have perdured? can't we have perdured? can't you have perdured? can't they have perdured?
V-ing perfect
can't I have been perduring? can't you have been perduring? can't he have been perduring? can't we have been perduring? can't you have been perduring? can't they have been perduring?