English verb conjugation
COULD PROOFREAD

Irregular verb: proofread - proofread - proofread

Affirmation

Simple form	V-ing form
I could proofread you could proofread he could proofread we could proofread you could proofread they could proofread	I could be proofreading you could be proofreading he could be proofreading we could be proofreading you could be proofreading they could be proofreading
Perfect	V-ing perfect
I could have proofread you could have proofread he could have proofread we could have proofread you could have proofread they could have proofread	I could have been proofreading you could have been proofreading he could have been proofreading we could have been proofreading you could have been proofreading they could have been proofreading

Negation

Simple form	V-ing form
I could not proofread you could not proofread he could not proofread we could not proofread you could not proofread they could not proofread	I could not be proofreading you could not be proofreading he could not be proofreading we could not be proofreading you could not be proofreading they could not be proofreading
Perfect	V-ing perfect
I could not have proofread you could not have proofread he could not have proofread we could not have proofread you could not have proofread they could not have proofread	I could not have been proofreading you could not have been proofreading he could not have been proofreading we could not have been proofreading you could not have been proofreading they could not have been proofreading

Interrogative form

Simple form	V-ing form
could I proofread? could you proofread? could he proofread? could we proofread? could you proofread? could they proofread?	could I be proofreading? could you be proofreading? could he be proofreading? could we be proofreading? could you be proofreading? could they be proofreading?
Perfect	V-ing perfect
could I have proofread? could you have proofread? could he have proofread? could we have proofread? could you have proofread? could they have proofread?	could I have been proofreading? could you have been proofreading? could he have been proofreading? could we have been proofreading? could you have been proofreading? could they have been proofreading?

Interro-negative form

Simple form	V-ing form
could I not proofread? could you not proofread? could he not proofread? could we not proofread? could you not proofread? could they not proofread?	could I not be proofreading? could you not be proofreading? could he not be proofreading? could we not be proofreading? could you not be proofreading? could they not be proofreading?
Perfect	V-ing perfect
could I not have proofread? could you not have proofread? could he not have proofread? could we not have proofread? could you not have proofread? could they not have proofread?	could I not have been proofreading? could you not have been proofreading? could he not have been proofreading? could we not have been proofreading? could you not have been proofreading? could they not have been proofreading?