I can echo you can echo he can echo we can echo you can echo they can echo
V-ing form
I can be echoing you can be echoing he can be echoing we can be echoing you can be echoing they can be echoing
Perfect
I can have echoed you can have echoed he can have echoed we can have echoed you can have echoed they can have echoed
V-ing perfect
I can have been echoing you can have been echoing he can have been echoing we can have been echoing you can have been echoing they can have been echoing
Negation
Simple form
I can't echo you can't echo he can't echo we can't echo you can't echo they can't echo
V-ing form
I can't be echoing you can't be echoing he can't be echoing we can't be echoing you can't be echoing they can't be echoing
Perfect
I can't have echoed you can't have echoed he can't have echoed we can't have echoed you can't have echoed they can't have echoed
V-ing perfect
I can't have been echoing you can't have been echoing he can't have been echoing we can't have been echoing you can't have been echoing they can't have been echoing
Interrogative form
Simple form
can I echo? can you echo? can he echo? can we echo? can you echo? can they echo?
V-ing form
can I be echoing? can you be echoing? can he be echoing? can we be echoing? can you be echoing? can they be echoing?
Perfect
can I have echoed? can you have echoed? can he have echoed? can we have echoed? can you have echoed? can they have echoed?
V-ing perfect
can I have been echoing? can you have been echoing? can he have been echoing? can we have been echoing? can you have been echoing? can they have been echoing?
Interro-negative form
Simple form
can't I echo? can't you echo? can't he echo? can't we echo? can't you echo? can't they echo?
V-ing form
can't I be echoing? can't you be echoing? can't he be echoing? can't we be echoing? can't you be echoing? can't they be echoing?
Perfect
can't I have echoed? can't you have echoed? can't he have echoed? can't we have echoed? can't you have echoed? can't they have echoed?
V-ing perfect
can't I have been echoing? can't you have been echoing? can't he have been echoing? can't we have been echoing? can't you have been echoing? can't they have been echoing?