I should sire you should sire he should sire we should sire you should sire they should sire
V-ing form
I should be siring you should be siring he should be siring we should be siring you should be siring they should be siring
Perfect
I should have sired you should have sired he should have sired we should have sired you should have sired they should have sired
V-ing perfect
I should have been siring you should have been siring he should have been siring we should have been siring you should have been siring they should have been siring
Negation
Simple form
I should not sire you should not sire he should not sire we should not sire you should not sire they should not sire
V-ing form
I should not be siring you should not be siring he should not be siring we should not be siring you should not be siring they should not be siring
Perfect
I should not have sired you should not have sired he should not have sired we should not have sired you should not have sired they should not have sired
V-ing perfect
I should not have been siring you should not have been siring he should not have been siring we should not have been siring you should not have been siring they should not have been siring
Interrogative form
Simple form
should I sire? should you sire? should he sire? should we sire? should you sire? should they sire?
V-ing form
should I be siring? should you be siring? should he be siring? should we be siring? should you be siring? should they be siring?
Perfect
should I have sired? should you have sired? should he have sired? should we have sired? should you have sired? should they have sired?
V-ing perfect
should I have been siring? should you have been siring? should he have been siring? should we have been siring? should you have been siring? should they have been siring?
Interro-negative form
Simple form
should I not sire? should you not sire? should he not sire? should we not sire? should you not sire? should they not sire?
V-ing form
should I not be siring? should you not be siring? should he not be siring? should we not be siring? should you not be siring? should they not be siring?
Perfect
should I not have sired? should you not have sired? should he not have sired? should we not have sired? should you not have sired? should they not have sired?
V-ing perfect
should I not have been siring? should you not have been siring? should he not have been siring? should we not have been siring? should you not have been siring? should they not have been siring?