I can bestir you can bestir he can bestir we can bestir you can bestir they can bestir
V-ing form
I can be bestirring you can be bestirring he can be bestirring we can be bestirring you can be bestirring they can be bestirring
Perfect
I can have bestirred you can have bestirred he can have bestirred we can have bestirred you can have bestirred they can have bestirred
V-ing perfect
I can have been bestirring you can have been bestirring he can have been bestirring we can have been bestirring you can have been bestirring they can have been bestirring
Negation
Simple form
I can't bestir you can't bestir he can't bestir we can't bestir you can't bestir they can't bestir
V-ing form
I can't be bestirring you can't be bestirring he can't be bestirring we can't be bestirring you can't be bestirring they can't be bestirring
Perfect
I can't have bestirred you can't have bestirred he can't have bestirred we can't have bestirred you can't have bestirred they can't have bestirred
V-ing perfect
I can't have been bestirring you can't have been bestirring he can't have been bestirring we can't have been bestirring you can't have been bestirring they can't have been bestirring
Interrogative form
Simple form
can I bestir? can you bestir? can he bestir? can we bestir? can you bestir? can they bestir?
V-ing form
can I be bestirring? can you be bestirring? can he be bestirring? can we be bestirring? can you be bestirring? can they be bestirring?
Perfect
can I have bestirred? can you have bestirred? can he have bestirred? can we have bestirred? can you have bestirred? can they have bestirred?
V-ing perfect
can I have been bestirring? can you have been bestirring? can he have been bestirring? can we have been bestirring? can you have been bestirring? can they have been bestirring?
Interro-negative form
Simple form
can't I bestir? can't you bestir? can't he bestir? can't we bestir? can't you bestir? can't they bestir?
V-ing form
can't I be bestirring? can't you be bestirring? can't he be bestirring? can't we be bestirring? can't you be bestirring? can't they be bestirring?
Perfect
can't I have bestirred? can't you have bestirred? can't he have bestirred? can't we have bestirred? can't you have bestirred? can't they have bestirred?
V-ing perfect
can't I have been bestirring? can't you have been bestirring? can't he have been bestirring? can't we have been bestirring? can't you have been bestirring? can't they have been bestirring?