should appal
Regular verb: appal - appaled- appaled

Affirmation 	
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I'd appal
you'd appal
he'd appal
we'd appal
you'd appal
they'd appal 	I'd be appaling
you'd be appaling
he'd be appaling
we'd be appaling
you'd be appaling
they'd be appaling	I should've appaled
you should've appaled
he should've appaled
we should've appaled
you should've appaled
they should've appaled	I should've been appaling
you should've been appaling
he should've been appaling
we should've been appaling
you should've been appaling
they should've been appaling	

Negation 	
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I shouldn't appal
you shouldn't appal
he shouldn't appal
we shouldn't appal
you shouldn't appal
they shouldn't appal 	I shouldn't be appaling
you shouldn't be appaling
he shouldn't be appaling
we shouldn't be appaling
you shouldn't be appaling
they shouldn't be appaling	I shouldn't have appaled
you shouldn't have appaled
he shouldn't have appaled
we shouldn't have appaled
you shouldn't have appaled
they shouldn't have appaled	I shouldn't have been appaling
you shouldn't have been appaling
he shouldn't have been appaling
we shouldn't have been appaling
you shouldn't have been appaling
they shouldn't have been appaling	

Interrogative form 	
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should I appal?
should you appal?
should he appal?
should we appal?
should you appal?
should they appal? 	should I be appaling?
should you be appaling?
should he be appaling?
should we be appaling?
should you be appaling?
should they be appaling? 	should I have appaled?
should you have appaled?
should he have appaled?
should we have appaled?
should you have appaled?
should they have appaled? 	should I have been appaling?
should you have been appaling?
should he have been appaling?
should we have been appaling?
should you have been appaling?
should they have been appaling? 	

Interro-negative form 	
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shouldn't I appal?
shouldn't you appal?
shouldn't he appal?
shouldn't we appal?
shouldn't you appal?
shouldn't they appal? 	shouldn't I be appaling?
shouldn't you be appaling?
shouldn't he be appaling?
shouldn't we be appaling?
shouldn't you be appaling?
shouldn't they be appaling? 	shouldn't I have appaled?
shouldn't you have appaled?
shouldn't he have appaled?
shouldn't we have appaled?
shouldn't you have appaled?
shouldn't they have appaled? 	shouldn't I have been appaling?
shouldn't you have been appaling?
shouldn't he have been appaling?
shouldn't we have been appaling?
shouldn't you have been appaling?
shouldn't they have been appaling?