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 couldn't preview
you couldn't preview
he couldn't preview
we couldn't preview
you couldn't preview
they couldn't preview 	I couldn't be previewing
you couldn't be previewing
he couldn't be previewing
we couldn't be previewing
you couldn't be previewing
they couldn't be previewing	I couldn't have previewed
you couldn't have previewed
he couldn't have previewed
we couldn't have previewed
you couldn't have previewed
they couldn't have previewed	I couldn't have been previewing
you couldn't have been previewing
he couldn't have been previewing
we couldn't have been previewing
you couldn't have been previewing
they couldn't 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 	
couldn't I preview?
couldn't you preview?
couldn't he preview?
couldn't we preview?
couldn't you preview?
couldn't they preview? 	couldn't I be previewing?
couldn't you be previewing?
couldn't he be previewing?
couldn't we be previewing?
couldn't you be previewing?
couldn't they be previewing? 	couldn't I have previewed?
couldn't you have previewed?
couldn't he have previewed?
couldn't we have previewed?
couldn't you have previewed?
couldn't they have previewed? 	couldn't I have been previewing?
couldn't you have been previewing?
couldn't he have been previewing?
couldn't we have been previewing?
couldn't you have been previewing?
couldn't they have been previewing?