I can reply you can reply he can reply we can reply you can reply they can reply
V-ing form
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
I can have replied you can have replied he can have replied we can have replied you can have replied they can have replied
V-ing perfect
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
I can't reply you can't reply he can't reply we can't reply you can't reply they can't reply
V-ing form
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
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
V-ing perfect
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
can I reply? can you reply? can he reply? can we reply? can you reply? can they reply?
V-ing form
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
can I have replied? can you have replied? can he have replied? can we have replied? can you have replied? can they have replied?
V-ing perfect
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
can't I reply? can't you reply? can't he reply? can't we reply? can't you reply? can't they reply?
V-ing form
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
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?
V-ing perfect
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?