English verb conjugation
CAN REPLY

Regular verb: reply - replied - replied

Affirmation

Simple form	V-ing form
I can reply you can reply he can reply we can reply you can reply they can reply	I can be replying you can be replying he can be replying we can be replying you can be replying they can be replying
Perfect	V-ing perfect
I can have replied you can have replied he can have replied we can have replied you can have replied they can have replied	I can have been replying you can have been replying he can have been replying we can have been replying you can have been replying they can have been replying

Negation

Simple form	V-ing form
I can't reply you can't reply he can't reply we can't reply you can't reply they can't reply	I can't be replying you can't be replying he can't be replying we can't be replying you can't be replying they can't be replying
Perfect	V-ing perfect
I can't have replied you can't have replied he can't have replied we can't have replied you can't have replied they can't have replied	I can't have been replying you can't have been replying he can't have been replying we can't have been replying you can't have been replying they can't have been replying

Interrogative form

Simple form	V-ing form
can I reply? can you reply? can he reply? can we reply? can you reply? can they reply?	can I be replying? can you be replying? can he be replying? can we be replying? can you be replying? can they be replying?
Perfect	V-ing perfect
can I have replied? can you have replied? can he have replied? can we have replied? can you have replied? can they have replied?	can I have been replying? can you have been replying? can he have been replying? can we have been replying? can you have been replying? can they have been replying?

Interro-negative form

Simple form	V-ing form
can't I reply? can't you reply? can't he reply? can't we reply? can't you reply? can't they reply?	can't I be replying? can't you be replying? can't he be replying? can't we be replying? can't you be replying? can't they be replying?
Perfect	V-ing perfect
can't I have replied? can't you have replied? can't he have replied? can't we have replied? can't you have replied? can't they have replied?	can't I have been replying? can't you have been replying? can't he have been replying? can't we have been replying? can't you have been replying? can't they have been replying?