can discover
Regular verb: discover - discovered- discovered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can discover
you can discover
she can discover
we can discover
you can discover
they can discover 	I can be discovering
you can be discovering
she can be discovering
we can be discovering
you can be discovering
they can be discovering	I can have discovered
you can have discovered
she can have discovered
we can have discovered
you can have discovered
they can have discovered	I can have been discovering
you can have been discovering
she can have been discovering
we can have been discovering
you can have been discovering
they can have been discovering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot discover
you cannot discover
she cannot discover
we cannot discover
you cannot discover
they cannot discover 	I cannot be discovering
you cannot be discovering
she cannot be discovering
we cannot be discovering
you cannot be discovering
they cannot be discovering	I cannot have discovered
you cannot have discovered
she cannot have discovered
we cannot have discovered
you cannot have discovered
they cannot have discovered	I cannot have been discovering
you cannot have been discovering
she cannot have been discovering
we cannot have been discovering
you cannot have been discovering
they cannot have been discovering	

Interrogative form 	
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can I discover?
can you discover?
can she discover?
can we discover?
can you discover?
can they discover? 	can I be discovering?
can you be discovering?
can she be discovering?
can we be discovering?
can you be discovering?
can they be discovering? 	can I have discovered?
can you have discovered?
can she have discovered?
can we have discovered?
can you have discovered?
can they have discovered? 	can I have been discovering?
can you have been discovering?
can she have been discovering?
can we have been discovering?
can you have been discovering?
can they have been discovering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not discover?
can you not discover?
can she not discover?
can we not discover?
can you not discover?
can they not discover? 	can I not be discovering?
can you not be discovering?
can she not be discovering?
can we not be discovering?
can you not be discovering?
can they not be discovering? 	can I not have discovered?
can you not have discovered?
can she not have discovered?
can we not have discovered?
can you not have discovered?
can they not have discovered? 	can I not have been discovering?
can you not have been discovering?
can she not have been discovering?
can we not have been discovering?
can you not have been discovering?
can they not have been discovering?