I should scratch you should scratch she should scratch we should scratch you should scratch they should scratch
V-ing form
I should be scratching you should be scratching she should be scratching we should be scratching you should be scratching they should be scratching
Perfect
I should have scratched you should have scratched she should have scratched we should have scratched you should have scratched they should have scratched
V-ing perfect
I should have been scratching you should have been scratching she should have been scratching we should have been scratching you should have been scratching they should have been scratching
Negation
Simple form
I should not scratch you should not scratch she should not scratch we should not scratch you should not scratch they should not scratch
V-ing form
I should not be scratching you should not be scratching she should not be scratching we should not be scratching you should not be scratching they should not be scratching
Perfect
I should not have scratched you should not have scratched she should not have scratched we should not have scratched you should not have scratched they should not have scratched
V-ing perfect
I should not have been scratching you should not have been scratching she should not have been scratching we should not have been scratching you should not have been scratching they should not have been scratching
Interrogative form
Simple form
should I scratch? should you scratch? should she scratch? should we scratch? should you scratch? should they scratch?
V-ing form
should I be scratching? should you be scratching? should she be scratching? should we be scratching? should you be scratching? should they be scratching?
Perfect
should I have scratched? should you have scratched? should she have scratched? should we have scratched? should you have scratched? should they have scratched?
V-ing perfect
should I have been scratching? should you have been scratching? should she have been scratching? should we have been scratching? should you have been scratching? should they have been scratching?
Interro-negative form
Simple form
should I not scratch? should you not scratch? should she not scratch? should we not scratch? should you not scratch? should they not scratch?
V-ing form
should I not be scratching? should you not be scratching? should she not be scratching? should we not be scratching? should you not be scratching? should they not be scratching?
Perfect
should I not have scratched? should you not have scratched? should she not have scratched? should we not have scratched? should you not have scratched? should they not have scratched?
V-ing perfect
should I not have been scratching? should you not have been scratching? should she not have been scratching? should we not have been scratching? should you not have been scratching? should they not have been scratching?