I should tug you should tug she should tug we should tug you should tug they should tug
V-ing form
I should be tugging you should be tugging she should be tugging we should be tugging you should be tugging they should be tugging
Perfect
I should have tugged you should have tugged she should have tugged we should have tugged you should have tugged they should have tugged
V-ing perfect
I should have been tugging you should have been tugging she should have been tugging we should have been tugging you should have been tugging they should have been tugging
Negation
Simple form
I should not tug you should not tug she should not tug we should not tug you should not tug they should not tug
V-ing form
I should not be tugging you should not be tugging she should not be tugging we should not be tugging you should not be tugging they should not be tugging
Perfect
I should not have tugged you should not have tugged she should not have tugged we should not have tugged you should not have tugged they should not have tugged
V-ing perfect
I should not have been tugging you should not have been tugging she should not have been tugging we should not have been tugging you should not have been tugging they should not have been tugging
Interrogative form
Simple form
should I tug? should you tug? should she tug? should we tug? should you tug? should they tug?
V-ing form
should I be tugging? should you be tugging? should she be tugging? should we be tugging? should you be tugging? should they be tugging?
Perfect
should I have tugged? should you have tugged? should she have tugged? should we have tugged? should you have tugged? should they have tugged?
V-ing perfect
should I have been tugging? should you have been tugging? should she have been tugging? should we have been tugging? should you have been tugging? should they have been tugging?
Interro-negative form
Simple form
should I not tug? should you not tug? should she not tug? should we not tug? should you not tug? should they not tug?
V-ing form
should I not be tugging? should you not be tugging? should she not be tugging? should we not be tugging? should you not be tugging? should they not be tugging?
Perfect
should I not have tugged? should you not have tugged? should she not have tugged? should we not have tugged? should you not have tugged? should they not have tugged?
V-ing perfect
should I not have been tugging? should you not have been tugging? should she not have been tugging? should we not have been tugging? should you not have been tugging? should they not have been tugging?