could appal
Regular verb: appal - appaled- appaled

Affirmation 	
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I could appal
you could appal
he could appal
we could appal
you could appal
they could appal 	I could be appaling
you could be appaling
he could be appaling
we could be appaling
you could be appaling
they could be appaling	I could have appaled
you could have appaled
he could have appaled
we could have appaled
you could have appaled
they could have appaled	I could have been appaling
you could have been appaling
he could have been appaling
we could have been appaling
you could have been appaling
they could have been appaling	

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

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

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