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