English verb conjugation
CAN APPEAR

Regular verb: appear - appeared - appeared

Affirmation

Simple form	V-ing form
I can appear you can appear she can appear we can appear you can appear they can appear	I can be appearing you can be appearing she can be appearing we can be appearing you can be appearing they can be appearing
Perfect	V-ing perfect
I can have appeared you can have appeared she 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 she 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
I cannot appear you cannot appear she cannot appear we cannot appear you cannot appear they cannot appear	I cannot be appearing you cannot be appearing she cannot be appearing we cannot be appearing you cannot be appearing they cannot be appearing
Perfect	V-ing perfect
I cannot have appeared you cannot have appeared she cannot have appeared we cannot have appeared you cannot have appeared they cannot have appeared	I cannot have been appearing you cannot have been appearing she cannot have been appearing we cannot have been appearing you cannot have been appearing they cannot have been appearing

Interrogative form

Simple form	V-ing form
can I appear? can you appear? can she appear? can we appear? can you appear? can they appear?	can I be appearing? can you be appearing? can she be appearing? can we be appearing? can you be appearing? can they be appearing?
Perfect	V-ing perfect
can I have appeared? can you have appeared? can she 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 she 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
can I not appear? can you not appear? can she not appear? can we not appear? can you not appear? can they not appear?	can I not be appearing? can you not be appearing? can she not be appearing? can we not be appearing? can you not be appearing? can they not be appearing?
Perfect	V-ing perfect
can I not have appeared? can you not have appeared? can she not have appeared? can we not have appeared? can you not have appeared? can they not have appeared?	can I not have been appearing? can you not have been appearing? can she not have been appearing? can we not have been appearing? can you not have been appearing? can they not have been appearing?