can appear
Regular verb: appear - appeared- appeared

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can appear
you can appear
he can appear
we can appear
you can appear
they can appear 	I can be appearing
you can be appearing
he can be appearing
we can be appearing
you can be appearing
they can be appearing	I can have appeared
you can have appeared
he can have appeared
we can have appeared
you can have appeared
they can have appeared	I can have been appearing
you can have been appearing
he can have been appearing
we can have been appearing
you can have been appearing
they can have been appearing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't appear
you can't appear
he can't appear
we can't appear
you can't appear
they can't appear 	I can't be appearing
you can't be appearing
he can't be appearing
we can't be appearing
you can't be appearing
they can't be appearing	I can't have appeared
you can't have appeared
he can't have appeared
we can't have appeared
you can't have appeared
they can't have appeared	I can't have been appearing
you can't have been appearing
he can't have been appearing
we can't have been appearing
you can't have been appearing
they can't have been appearing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I appear?
can you appear?
can he appear?
can we appear?
can you appear?
can they appear? 	can I be appearing?
can you be appearing?
can he be appearing?
can we be appearing?
can you be appearing?
can they be appearing? 	can I have appeared?
can you have appeared?
can he have appeared?
can we have appeared?
can you have appeared?
can they have appeared? 	can I have been appearing?
can you have been appearing?
can he have been appearing?
can we have been appearing?
can you have been appearing?
can they have been appearing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I appear?
can't you appear?
can't he appear?
can't we appear?
can't you appear?
can't they appear? 	can't I be appearing?
can't you be appearing?
can't he be appearing?
can't we be appearing?
can't you be appearing?
can't they be appearing? 	can't I have appeared?
can't you have appeared?
can't he have appeared?
can't we have appeared?
can't you have appeared?
can't they have appeared? 	can't I have been appearing?
can't you have been appearing?
can't he have been appearing?
can't we have been appearing?
can't you have been appearing?
can't they have been appearing?