English verb conjugation
COULD PREVIEW

Regular verb: preview - previewed - previewed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?