I can submit you can submit he can submit we can submit you can submit they can submit
V-ing form
I can be submitting you can be submitting he can be submitting we can be submitting you can be submitting they can be submitting
Perfect
I can have submitted you can have submitted he can have submitted we can have submitted you can have submitted they can have submitted
V-ing perfect
I can have been submitting you can have been submitting he can have been submitting we can have been submitting you can have been submitting they can have been submitting
Negation
Simple form
I can't submit you can't submit he can't submit we can't submit you can't submit they can't submit
V-ing form
I can't be submitting you can't be submitting he can't be submitting we can't be submitting you can't be submitting they can't be submitting
Perfect
I can't have submitted you can't have submitted he can't have submitted we can't have submitted you can't have submitted they can't have submitted
V-ing perfect
I can't have been submitting you can't have been submitting he can't have been submitting we can't have been submitting you can't have been submitting they can't have been submitting
Interrogative form
Simple form
can I submit? can you submit? can he submit? can we submit? can you submit? can they submit?
V-ing form
can I be submitting? can you be submitting? can he be submitting? can we be submitting? can you be submitting? can they be submitting?
Perfect
can I have submitted? can you have submitted? can he have submitted? can we have submitted? can you have submitted? can they have submitted?
V-ing perfect
can I have been submitting? can you have been submitting? can he have been submitting? can we have been submitting? can you have been submitting? can they have been submitting?
Interro-negative form
Simple form
can't I submit? can't you submit? can't he submit? can't we submit? can't you submit? can't they submit?
V-ing form
can't I be submitting? can't you be submitting? can't he be submitting? can't we be submitting? can't you be submitting? can't they be submitting?
Perfect
can't I have submitted? can't you have submitted? can't he have submitted? can't we have submitted? can't you have submitted? can't they have submitted?
V-ing perfect
can't I have been submitting? can't you have been submitting? can't he have been submitting? can't we have been submitting? can't you have been submitting? can't they have been submitting?