English verb conjugation
COULD PREVIEW

Regular verb: preview - previewed - previewed

Affirmation

Simple form	V-ing form
I could preview you could preview she could preview we could preview you could preview they could preview	I could be previewing you could be previewing she 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 she 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 she 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 couldn't preview you couldn't preview she 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 she couldn't be previewing we couldn't be previewing you couldn't be previewing they couldn't be previewing
Perfect	V-ing perfect
I couldn't have previewed you couldn't have previewed she 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 she 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
could I preview? could you preview? could she preview? could we preview? could you preview? could they preview?	could I be previewing? could you be previewing? could she 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 she 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 she 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
couldn't I preview? couldn't you preview? couldn't she 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 she be previewing? couldn't we be previewing? couldn't you be previewing? couldn't they be previewing?
Perfect	V-ing perfect
couldn't I have previewed? couldn't you have previewed? couldn't she 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 she have been previewing? couldn't we have been previewing? couldn't you have been previewing? couldn't they have been previewing?