I can upload you can upload he can upload we can upload you can upload they can upload
V-ing form
I can be uploading you can be uploading he can be uploading we can be uploading you can be uploading they can be uploading
Perfect
I can have uploaded you can have uploaded he can have uploaded we can have uploaded you can have uploaded they can have uploaded
V-ing perfect
I can have been uploading you can have been uploading he can have been uploading we can have been uploading you can have been uploading they can have been uploading
Negation
Simple form
I can't upload you can't upload he can't upload we can't upload you can't upload they can't upload
V-ing form
I can't be uploading you can't be uploading he can't be uploading we can't be uploading you can't be uploading they can't be uploading
Perfect
I can't have uploaded you can't have uploaded he can't have uploaded we can't have uploaded you can't have uploaded they can't have uploaded
V-ing perfect
I can't have been uploading you can't have been uploading he can't have been uploading we can't have been uploading you can't have been uploading they can't have been uploading
Interrogative form
Simple form
can I upload? can you upload? can he upload? can we upload? can you upload? can they upload?
V-ing form
can I be uploading? can you be uploading? can he be uploading? can we be uploading? can you be uploading? can they be uploading?
Perfect
can I have uploaded? can you have uploaded? can he have uploaded? can we have uploaded? can you have uploaded? can they have uploaded?
V-ing perfect
can I have been uploading? can you have been uploading? can he have been uploading? can we have been uploading? can you have been uploading? can they have been uploading?
Interro-negative form
Simple form
can't I upload? can't you upload? can't he upload? can't we upload? can't you upload? can't they upload?
V-ing form
can't I be uploading? can't you be uploading? can't he be uploading? can't we be uploading? can't you be uploading? can't they be uploading?
Perfect
can't I have uploaded? can't you have uploaded? can't he have uploaded? can't we have uploaded? can't you have uploaded? can't they have uploaded?
V-ing perfect
can't I have been uploading? can't you have been uploading? can't he have been uploading? can't we have been uploading? can't you have been uploading? can't they have been uploading?