English verb conjugation
CAN PREVIEW

Regular verb: preview - previewed - previewed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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