I should sketch you should sketch she should sketch we should sketch you should sketch they should sketch
V-ing form
I should be sketching you should be sketching she should be sketching we should be sketching you should be sketching they should be sketching
Perfect
I should have sketched you should have sketched she should have sketched we should have sketched you should have sketched they should have sketched
V-ing perfect
I should have been sketching you should have been sketching she should have been sketching we should have been sketching you should have been sketching they should have been sketching
Negation
Simple form
I should not sketch you should not sketch she should not sketch we should not sketch you should not sketch they should not sketch
V-ing form
I should not be sketching you should not be sketching she should not be sketching we should not be sketching you should not be sketching they should not be sketching
Perfect
I should not have sketched you should not have sketched she should not have sketched we should not have sketched you should not have sketched they should not have sketched
V-ing perfect
I should not have been sketching you should not have been sketching she should not have been sketching we should not have been sketching you should not have been sketching they should not have been sketching
Interrogative form
Simple form
should I sketch? should you sketch? should she sketch? should we sketch? should you sketch? should they sketch?
V-ing form
should I be sketching? should you be sketching? should she be sketching? should we be sketching? should you be sketching? should they be sketching?
Perfect
should I have sketched? should you have sketched? should she have sketched? should we have sketched? should you have sketched? should they have sketched?
V-ing perfect
should I have been sketching? should you have been sketching? should she have been sketching? should we have been sketching? should you have been sketching? should they have been sketching?
Interro-negative form
Simple form
should I not sketch? should you not sketch? should she not sketch? should we not sketch? should you not sketch? should they not sketch?
V-ing form
should I not be sketching? should you not be sketching? should she not be sketching? should we not be sketching? should you not be sketching? should they not be sketching?
Perfect
should I not have sketched? should you not have sketched? should she not have sketched? should we not have sketched? should you not have sketched? should they not have sketched?
V-ing perfect
should I not have been sketching? should you not have been sketching? should she not have been sketching? should we not have been sketching? should you not have been sketching? should they not have been sketching?