I could upload you could upload she could upload we could upload you could upload they could upload
V-ing form
I could be uploading you could be uploading she could be uploading we could be uploading you could be uploading they could be uploading
Perfect
I could have uploaded you could have uploaded she could have uploaded we could have uploaded you could have uploaded they could have uploaded
V-ing perfect
I could have been uploading you could have been uploading she could have been uploading we could have been uploading you could have been uploading they could have been uploading
Negation
Simple form
I could not upload you could not upload she could not upload we could not upload you could not upload they could not upload
V-ing form
I could not be uploading you could not be uploading she could not be uploading we could not be uploading you could not be uploading they could not be uploading
Perfect
I could not have uploaded you could not have uploaded she could not have uploaded we could not have uploaded you could not have uploaded they could not have uploaded
V-ing perfect
I could not have been uploading you could not have been uploading she could not have been uploading we could not have been uploading you could not have been uploading they could not have been uploading
Interrogative form
Simple form
could I upload? could you upload? could she upload? could we upload? could you upload? could they upload?
V-ing form
could I be uploading? could you be uploading? could she be uploading? could we be uploading? could you be uploading? could they be uploading?
Perfect
could I have uploaded? could you have uploaded? could she have uploaded? could we have uploaded? could you have uploaded? could they have uploaded?
V-ing perfect
could I have been uploading? could you have been uploading? could she have been uploading? could we have been uploading? could you have been uploading? could they have been uploading?
Interro-negative form
Simple form
could I not upload? could you not upload? could she not upload? could we not upload? could you not upload? could they not upload?
V-ing form
could I not be uploading? could you not be uploading? could she not be uploading? could we not be uploading? could you not be uploading? could they not be uploading?
Perfect
could I not have uploaded? could you not have uploaded? could she not have uploaded? could we not have uploaded? could you not have uploaded? could they not have uploaded?
V-ing perfect
could I not have been uploading? could you not have been uploading? could she not have been uploading? could we not have been uploading? could you not have been uploading? could they not have been uploading?