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 can't preview you can't preview he can't preview we can't preview you can't preview they can't preview	I can't be previewing you can't be previewing he can't be previewing we can't be previewing you can't be previewing they can't be previewing
Perfect	V-ing perfect
I can't have previewed you can't have previewed he can't have previewed we can't have previewed you can't have previewed they can't have previewed	I can't have been previewing you can't have been previewing he can't have been previewing we can't have been previewing you can't have been previewing they can't 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't I preview? can't you preview? can't he preview? can't we preview? can't you preview? can't they preview?	can't I be previewing? can't you be previewing? can't he be previewing? can't we be previewing? can't you be previewing? can't they be previewing?
Perfect	V-ing perfect
can't I have previewed? can't you have previewed? can't he have previewed? can't we have previewed? can't you have previewed? can't they have previewed?	can't I have been previewing? can't you have been previewing? can't he have been previewing? can't we have been previewing? can't you have been previewing? can't they have been previewing?