can echo
Regular verb: echo - echoed- echoed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can echo
you can echo
she can echo
we can echo
you can echo
they can echo 	I can be echoing
you can be echoing
she can be echoing
we can be echoing
you can be echoing
they can be echoing	I can have echoed
you can have echoed
she can have echoed
we can have echoed
you can have echoed
they can have echoed	I can have been echoing
you can have been echoing
she can have been echoing
we can have been echoing
you can have been echoing
they can have been echoing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot echo
you cannot echo
she cannot echo
we cannot echo
you cannot echo
they cannot echo 	I cannot be echoing
you cannot be echoing
she cannot be echoing
we cannot be echoing
you cannot be echoing
they cannot be echoing	I cannot have echoed
you cannot have echoed
she cannot have echoed
we cannot have echoed
you cannot have echoed
they cannot have echoed	I cannot have been echoing
you cannot have been echoing
she cannot have been echoing
we cannot have been echoing
you cannot have been echoing
they cannot have been echoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I echo?
can you echo?
can she echo?
can we echo?
can you echo?
can they echo? 	can I be echoing?
can you be echoing?
can she be echoing?
can we be echoing?
can you be echoing?
can they be echoing? 	can I have echoed?
can you have echoed?
can she have echoed?
can we have echoed?
can you have echoed?
can they have echoed? 	can I have been echoing?
can you have been echoing?
can she have been echoing?
can we have been echoing?
can you have been echoing?
can they have been echoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not echo?
can you not echo?
can she not echo?
can we not echo?
can you not echo?
can they not echo? 	can I not be echoing?
can you not be echoing?
can she not be echoing?
can we not be echoing?
can you not be echoing?
can they not be echoing? 	can I not have echoed?
can you not have echoed?
can she not have echoed?
can we not have echoed?
can you not have echoed?
can they not have echoed? 	can I not have been echoing?
can you not have been echoing?
can she not have been echoing?
can we not have been echoing?
can you not have been echoing?
can they not have been echoing?