English verb conjugation
SHOULD SMILE

Regular verb: smile - smiled - smiled

Affirmation

Simple form	V-ing form
I'd smile you'd smile he'd smile we'd smile you'd smile they'd smile	I'd be smiling you'd be smiling he'd be smiling we'd be smiling you'd be smiling they'd be smiling
Perfect	V-ing perfect
I should've smiled you should've smiled he should've smiled we should've smiled you should've smiled they should've smiled	I should've been smiling you should've been smiling he should've been smiling we should've been smiling you should've been smiling they should've been smiling

Negation

Simple form	V-ing form
I shouldn't smile you shouldn't smile he shouldn't smile we shouldn't smile you shouldn't smile they shouldn't smile	I shouldn't be smiling you shouldn't be smiling he shouldn't be smiling we shouldn't be smiling you shouldn't be smiling they shouldn't be smiling
Perfect	V-ing perfect
I shouldn't have smiled you shouldn't have smiled he shouldn't have smiled we shouldn't have smiled you shouldn't have smiled they shouldn't have smiled	I shouldn't have been smiling you shouldn't have been smiling he shouldn't have been smiling we shouldn't have been smiling you shouldn't have been smiling they shouldn't have been smiling

Interrogative form

Simple form	V-ing form
should I smile? should you smile? should he smile? should we smile? should you smile? should they smile?	should I be smiling? should you be smiling? should he be smiling? should we be smiling? should you be smiling? should they be smiling?
Perfect	V-ing perfect
should I have smiled? should you have smiled? should he have smiled? should we have smiled? should you have smiled? should they have smiled?	should I have been smiling? should you have been smiling? should he have been smiling? should we have been smiling? should you have been smiling? should they have been smiling?

Interro-negative form

Simple form	V-ing form
shouldn't I smile? shouldn't you smile? shouldn't he smile? shouldn't we smile? shouldn't you smile? shouldn't they smile?	shouldn't I be smiling? shouldn't you be smiling? shouldn't he be smiling? shouldn't we be smiling? shouldn't you be smiling? shouldn't they be smiling?
Perfect	V-ing perfect
shouldn't I have smiled? shouldn't you have smiled? shouldn't he have smiled? shouldn't we have smiled? shouldn't you have smiled? shouldn't they have smiled?	shouldn't I have been smiling? shouldn't you have been smiling? shouldn't he have been smiling? shouldn't we have been smiling? shouldn't you have been smiling? shouldn't they have been smiling?