I'd be stumbling you'd be stumbling he'd be stumbling we'd be stumbling you'd be stumbling they'd be stumbling
Perfect
I should've stumbled you should've stumbled he should've stumbled we should've stumbled you should've stumbled they should've stumbled
V-ing perfect
I should've been stumbling you should've been stumbling he should've been stumbling we should've been stumbling you should've been stumbling they should've been stumbling
Negation
Simple form
I shouldn't stumble you shouldn't stumble he shouldn't stumble we shouldn't stumble you shouldn't stumble they shouldn't stumble
V-ing form
I shouldn't be stumbling you shouldn't be stumbling he shouldn't be stumbling we shouldn't be stumbling you shouldn't be stumbling they shouldn't be stumbling
Perfect
I shouldn't have stumbled you shouldn't have stumbled he shouldn't have stumbled we shouldn't have stumbled you shouldn't have stumbled they shouldn't have stumbled
V-ing perfect
I shouldn't have been stumbling you shouldn't have been stumbling he shouldn't have been stumbling we shouldn't have been stumbling you shouldn't have been stumbling they shouldn't have been stumbling
Interrogative form
Simple form
should I stumble? should you stumble? should he stumble? should we stumble? should you stumble? should they stumble?
V-ing form
should I be stumbling? should you be stumbling? should he be stumbling? should we be stumbling? should you be stumbling? should they be stumbling?
Perfect
should I have stumbled? should you have stumbled? should he have stumbled? should we have stumbled? should you have stumbled? should they have stumbled?
V-ing perfect
should I have been stumbling? should you have been stumbling? should he have been stumbling? should we have been stumbling? should you have been stumbling? should they have been stumbling?
Interro-negative form
Simple form
shouldn't I stumble? shouldn't you stumble? shouldn't he stumble? shouldn't we stumble? shouldn't you stumble? shouldn't they stumble?
V-ing form
shouldn't I be stumbling? shouldn't you be stumbling? shouldn't he be stumbling? shouldn't we be stumbling? shouldn't you be stumbling? shouldn't they be stumbling?
Perfect
shouldn't I have stumbled? shouldn't you have stumbled? shouldn't he have stumbled? shouldn't we have stumbled? shouldn't you have stumbled? shouldn't they have stumbled?
V-ing perfect
shouldn't I have been stumbling? shouldn't you have been stumbling? shouldn't he have been stumbling? shouldn't we have been stumbling? shouldn't you have been stumbling? shouldn't they have been stumbling?