can appall
Regular verb: appall - appalled- appalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can appall
you can appall
she can appall
we can appall
you can appall
they can appall 	I can be appalling
you can be appalling
she can be appalling
we can be appalling
you can be appalling
they can be appalling	I can have appalled
you can have appalled
she can have appalled
we can have appalled
you can have appalled
they can have appalled	I can have been appalling
you can have been appalling
she can have been appalling
we can have been appalling
you can have been appalling
they can have been appalling	

Negation 	
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I can't appall
you can't appall
she can't appall
we can't appall
you can't appall
they can't appall 	I can't be appalling
you can't be appalling
she can't be appalling
we can't be appalling
you can't be appalling
they can't be appalling	I can't have appalled
you can't have appalled
she can't have appalled
we can't have appalled
you can't have appalled
they can't have appalled	I can't have been appalling
you can't have been appalling
she can't have been appalling
we can't have been appalling
you can't have been appalling
they can't have been appalling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I appall?
can you appall?
can she appall?
can we appall?
can you appall?
can they appall? 	can I be appalling?
can you be appalling?
can she be appalling?
can we be appalling?
can you be appalling?
can they be appalling? 	can I have appalled?
can you have appalled?
can she have appalled?
can we have appalled?
can you have appalled?
can they have appalled? 	can I have been appalling?
can you have been appalling?
can she have been appalling?
can we have been appalling?
can you have been appalling?
can they have been appalling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I appall?
can't you appall?
can't she appall?
can't we appall?
can't you appall?
can't they appall? 	can't I be appalling?
can't you be appalling?
can't she be appalling?
can't we be appalling?
can't you be appalling?
can't they be appalling? 	can't I have appalled?
can't you have appalled?
can't she have appalled?
can't we have appalled?
can't you have appalled?
can't they have appalled? 	can't I have been appalling?
can't you have been appalling?
can't she have been appalling?
can't we have been appalling?
can't you have been appalling?
can't they have been appalling?