I should untie you should untie he should untie we should untie you should untie they should untie
V-ing form
I should be untying you should be untying he should be untying we should be untying you should be untying they should be untying
Perfect
I should have untied you should have untied he should have untied we should have untied you should have untied they should have untied
V-ing perfect
I should have been untying you should have been untying he should have been untying we should have been untying you should have been untying they should have been untying
Negation
Simple form
I should not untie you should not untie he should not untie we should not untie you should not untie they should not untie
V-ing form
I should not be untying you should not be untying he should not be untying we should not be untying you should not be untying they should not be untying
Perfect
I should not have untied you should not have untied he should not have untied we should not have untied you should not have untied they should not have untied
V-ing perfect
I should not have been untying you should not have been untying he should not have been untying we should not have been untying you should not have been untying they should not have been untying
Interrogative form
Simple form
should I untie? should you untie? should he untie? should we untie? should you untie? should they untie?
V-ing form
should I be untying? should you be untying? should he be untying? should we be untying? should you be untying? should they be untying?
Perfect
should I have untied? should you have untied? should he have untied? should we have untied? should you have untied? should they have untied?
V-ing perfect
should I have been untying? should you have been untying? should he have been untying? should we have been untying? should you have been untying? should they have been untying?
Interro-negative form
Simple form
should I not untie? should you not untie? should he not untie? should we not untie? should you not untie? should they not untie?
V-ing form
should I not be untying? should you not be untying? should he not be untying? should we not be untying? should you not be untying? should they not be untying?
Perfect
should I not have untied? should you not have untied? should he not have untied? should we not have untied? should you not have untied? should they not have untied?
V-ing perfect
should I not have been untying? should you not have been untying? should he not have been untying? should we not have been untying? should you not have been untying? should they not have been untying?