could preview
Regular verb: preview - previewed- previewed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preview
you could preview
he could preview
we could preview
you could preview
they could preview 	I could be previewing
you could be previewing
he could be previewing
we could be previewing
you could be previewing
they could be previewing	I could have previewed
you could have previewed
he could have previewed
we could have previewed
you could have previewed
they could have previewed	I could have been previewing
you could have been previewing
he could have been previewing
we could have been previewing
you could have been previewing
they could have been previewing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not preview
you could not preview
he could not preview
we could not preview
you could not preview
they could not preview 	I could not be previewing
you could not be previewing
he could not be previewing
we could not be previewing
you could not be previewing
they could not be previewing	I could not have previewed
you could not have previewed
he could not have previewed
we could not have previewed
you could not have previewed
they could not have previewed	I could not have been previewing
you could not have been previewing
he could not have been previewing
we could not have been previewing
you could not have been previewing
they could not have been previewing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I preview?
could you preview?
could he preview?
could we preview?
could you preview?
could they preview? 	could I be previewing?
could you be previewing?
could he be previewing?
could we be previewing?
could you be previewing?
could they be previewing? 	could I have previewed?
could you have previewed?
could he have previewed?
could we have previewed?
could you have previewed?
could they have previewed? 	could I have been previewing?
could you have been previewing?
could he have been previewing?
could we have been previewing?
could you have been previewing?
could they have been previewing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not preview?
could you not preview?
could he not preview?
could we not preview?
could you not preview?
could they not preview? 	could I not be previewing?
could you not be previewing?
could he not be previewing?
could we not be previewing?
could you not be previewing?
could they not be previewing? 	could I not have previewed?
could you not have previewed?
could he not have previewed?
could we not have previewed?
could you not have previewed?
could they not have previewed? 	could I not have been previewing?
could you not have been previewing?
could he not have been previewing?
could we not have been previewing?
could you not have been previewing?
could they not have been previewing?