English verb conjugation
SHOULD UNDERSTUDY

Regular verb: understudy - understudied - understudied

Affirmation

Simple form	V-ing form
I'd understudy you'd understudy she'd understudy we'd understudy you'd understudy they'd understudy	I'd be understudying you'd be understudying she'd be understudying we'd be understudying you'd be understudying they'd be understudying
Perfect	V-ing perfect
I should've understudied you should've understudied she should've understudied we should've understudied you should've understudied they should've understudied	I should've been understudying you should've been understudying she should've been understudying we should've been understudying you should've been understudying they should've been understudying

Negation

Simple form	V-ing form
I shouldn't understudy you shouldn't understudy she shouldn't understudy we shouldn't understudy you shouldn't understudy they shouldn't understudy	I shouldn't be understudying you shouldn't be understudying she shouldn't be understudying we shouldn't be understudying you shouldn't be understudying they shouldn't be understudying
Perfect	V-ing perfect
I shouldn't have understudied you shouldn't have understudied she shouldn't have understudied we shouldn't have understudied you shouldn't have understudied they shouldn't have understudied	I shouldn't have been understudying you shouldn't have been understudying she shouldn't have been understudying we shouldn't have been understudying you shouldn't have been understudying they shouldn't have been understudying

Interrogative form

Simple form	V-ing form
should I understudy? should you understudy? should she understudy? should we understudy? should you understudy? should they understudy?	should I be understudying? should you be understudying? should she be understudying? should we be understudying? should you be understudying? should they be understudying?
Perfect	V-ing perfect
should I have understudied? should you have understudied? should she have understudied? should we have understudied? should you have understudied? should they have understudied?	should I have been understudying? should you have been understudying? should she have been understudying? should we have been understudying? should you have been understudying? should they have been understudying?

Interro-negative form

Simple form	V-ing form
shouldn't I understudy? shouldn't you understudy? shouldn't she understudy? shouldn't we understudy? shouldn't you understudy? shouldn't they understudy?	shouldn't I be understudying? shouldn't you be understudying? shouldn't she be understudying? shouldn't we be understudying? shouldn't you be understudying? shouldn't they be understudying?
Perfect	V-ing perfect
shouldn't I have understudied? shouldn't you have understudied? shouldn't she have understudied? shouldn't we have understudied? shouldn't you have understudied? shouldn't they have understudied?	shouldn't I have been understudying? shouldn't you have been understudying? shouldn't she have been understudying? shouldn't we have been understudying? shouldn't you have been understudying? shouldn't they have been understudying?