I'd be trekking you'd be trekking she'd be trekking we'd be trekking you'd be trekking they'd be trekking
Perfect
I should've trekked you should've trekked she should've trekked we should've trekked you should've trekked they should've trekked
V-ing perfect
I should've been trekking you should've been trekking she should've been trekking we should've been trekking you should've been trekking they should've been trekking
Negation
Simple form
I shouldn't trek you shouldn't trek she shouldn't trek we shouldn't trek you shouldn't trek they shouldn't trek
V-ing form
I shouldn't be trekking you shouldn't be trekking she shouldn't be trekking we shouldn't be trekking you shouldn't be trekking they shouldn't be trekking
Perfect
I shouldn't have trekked you shouldn't have trekked she shouldn't have trekked we shouldn't have trekked you shouldn't have trekked they shouldn't have trekked
V-ing perfect
I shouldn't have been trekking you shouldn't have been trekking she shouldn't have been trekking we shouldn't have been trekking you shouldn't have been trekking they shouldn't have been trekking
Interrogative form
Simple form
should I trek? should you trek? should she trek? should we trek? should you trek? should they trek?
V-ing form
should I be trekking? should you be trekking? should she be trekking? should we be trekking? should you be trekking? should they be trekking?
Perfect
should I have trekked? should you have trekked? should she have trekked? should we have trekked? should you have trekked? should they have trekked?
V-ing perfect
should I have been trekking? should you have been trekking? should she have been trekking? should we have been trekking? should you have been trekking? should they have been trekking?
Interro-negative form
Simple form
shouldn't I trek? shouldn't you trek? shouldn't she trek? shouldn't we trek? shouldn't you trek? shouldn't they trek?
V-ing form
shouldn't I be trekking? shouldn't you be trekking? shouldn't she be trekking? shouldn't we be trekking? shouldn't you be trekking? shouldn't they be trekking?
Perfect
shouldn't I have trekked? shouldn't you have trekked? shouldn't she have trekked? shouldn't we have trekked? shouldn't you have trekked? shouldn't they have trekked?
V-ing perfect
shouldn't I have been trekking? shouldn't you have been trekking? shouldn't she have been trekking? shouldn't we have been trekking? shouldn't you have been trekking? shouldn't they have been trekking?