can cavern
Regular verb: cavern - caverned- caverned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can cavern
you can cavern
she can cavern
we can cavern
you can cavern
they can cavern 	I can be caverning
you can be caverning
she can be caverning
we can be caverning
you can be caverning
they can be caverning	I can have caverned
you can have caverned
she can have caverned
we can have caverned
you can have caverned
they can have caverned	I can have been caverning
you can have been caverning
she can have been caverning
we can have been caverning
you can have been caverning
they can have been caverning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't cavern
you can't cavern
she can't cavern
we can't cavern
you can't cavern
they can't cavern 	I can't be caverning
you can't be caverning
she can't be caverning
we can't be caverning
you can't be caverning
they can't be caverning	I can't have caverned
you can't have caverned
she can't have caverned
we can't have caverned
you can't have caverned
they can't have caverned	I can't have been caverning
you can't have been caverning
she can't have been caverning
we can't have been caverning
you can't have been caverning
they can't have been caverning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I cavern?
can you cavern?
can she cavern?
can we cavern?
can you cavern?
can they cavern? 	can I be caverning?
can you be caverning?
can she be caverning?
can we be caverning?
can you be caverning?
can they be caverning? 	can I have caverned?
can you have caverned?
can she have caverned?
can we have caverned?
can you have caverned?
can they have caverned? 	can I have been caverning?
can you have been caverning?
can she have been caverning?
can we have been caverning?
can you have been caverning?
can they have been caverning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I cavern?
can't you cavern?
can't she cavern?
can't we cavern?
can't you cavern?
can't they cavern? 	can't I be caverning?
can't you be caverning?
can't she be caverning?
can't we be caverning?
can't you be caverning?
can't they be caverning? 	can't I have caverned?
can't you have caverned?
can't she have caverned?
can't we have caverned?
can't you have caverned?
can't they have caverned? 	can't I have been caverning?
can't you have been caverning?
can't she have been caverning?
can't we have been caverning?
can't you have been caverning?
can't they have been caverning?