I could upload you could upload he could upload we could upload you could upload they could upload
V-ing form
I could be uploading you could be uploading he could be uploading we could be uploading you could be uploading they could be uploading
Perfect
I could have uploaded you could have uploaded he 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 he 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 he 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 he 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 he 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 he 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 he upload? could we upload? could you upload? could they upload?
V-ing form
could I be uploading? could you be uploading? could he be uploading? could we be uploading? could you be uploading? could they be uploading?
Perfect
could I have uploaded? could you have uploaded? could he 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 he 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 he 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 he 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 he 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 he not have been uploading? could we not have been uploading? could you not have been uploading? could they not have been uploading?