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 can't discover
you can't discover
she can't discover
we can't discover
you can't discover
they can't discover 	I can't be discovering
you can't be discovering
she can't be discovering
we can't be discovering
you can't be discovering
they can't be discovering	I can't have discovered
you can't have discovered
she can't have discovered
we can't have discovered
you can't have discovered
they can't have discovered	I can't have been discovering
you can't have been discovering
she can't have been discovering
we can't have been discovering
you can't have been discovering
they can't have been discovering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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't I discover?
can't you discover?
can't she discover?
can't we discover?
can't you discover?
can't they discover? 	can't I be discovering?
can't you be discovering?
can't she be discovering?
can't we be discovering?
can't you be discovering?
can't they be discovering? 	can't I have discovered?
can't you have discovered?
can't she have discovered?
can't we have discovered?
can't you have discovered?
can't they have discovered? 	can't I have been discovering?
can't you have been discovering?
can't she have been discovering?
can't we have been discovering?
can't you have been discovering?
can't they have been discovering?