English verb conjugation
CAN DISCOVER

Regular verb: discover - discovered - discovered

Affirmation

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