should scratch
Regular verb: scratch - scratched- scratched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should scratch
you should scratch
she should scratch
we should scratch
you should scratch
they should scratch 	I should be scratching
you should be scratching
she should be scratching
we should be scratching
you should be scratching
they should be scratching	I should have scratched
you should have scratched
she should have scratched
we should have scratched
you should have scratched
they should have scratched	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 	V-ing form 	Perfect 	V-ing perfect 	
I should not scratch
you should not scratch
she should not scratch
we should not scratch
you should not scratch
they should not scratch 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
should I scratch?
should you scratch?
should she scratch?
should we scratch?
should you scratch?
should they scratch? 	should I be scratching?
should you be scratching?
should she be scratching?
should we be scratching?
should you be scratching?
should they be scratching? 	should I have scratched?
should you have scratched?
should she have scratched?
should we have scratched?
should you have scratched?
should they have scratched? 	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 	V-ing form 	Perfect 	V-ing perfect 	
should I not scratch?
should you not scratch?
should she not scratch?
should we not scratch?
should you not scratch?
should they not scratch? 	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? 	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? 	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?