English verb conjugation COULD DISCOVER

Regular verb: discover - discovered - discovered

Affirmation

Simple form

I could discover
you could discover
she could discover
we could discover
you could discover
they could discover

V-ing form

I could be discovering
you could be discovering
she could be discovering
we could be discovering
you could be discovering
they could be discovering

Perfect

I could have discovered
you could have discovered
she could have discovered
we could have discovered
you could have discovered
they could have discovered

V-ing perfect

I could have been discovering
you could have been discovering
she could have been discovering
we could have been discovering
you could have been discovering
they could have been discovering

Negation

Simple form

I couldn't discover
you couldn't discover
she couldn't discover
we couldn't discover
you couldn't discover
they couldn't discover

V-ing form

I couldn't be discovering
you couldn't be discovering
she couldn't be discovering
we couldn't be discovering
you couldn't be discovering
they couldn't be discovering

Perfect

I couldn't have discovered
you couldn't have discovered
she couldn't have discovered
we couldn't have discovered
you couldn't have discovered
they couldn't have discovered

V-ing perfect

I couldn't have been discovering
you couldn't have been discovering
she couldn't have been discovering
we couldn't have been discovering
you couldn't have been discovering
they couldn't have been discovering

Interrogative form

Simple form

could I discover?
could you discover?
could she discover?
could we discover?
could you discover?
could they discover?

V-ing form

could I be discovering?
could you be discovering?
could she be discovering?
could we be discovering?
could you be discovering?
could they be discovering?

Perfect

could I have discovered?
could you have discovered?
could she have discovered?
could we have discovered?
could you have discovered?
could they have discovered?

V-ing perfect

could I have been discovering?
could you have been discovering?
could she have been discovering?
could we have been discovering?
could you have been discovering?
could they have been discovering?

Interro-negative form

Simple form

couldn't I discover?
couldn't you discover?
couldn't she discover?
couldn't we discover?
couldn't you discover?
couldn't they discover?

V-ing form

couldn't I be discovering?
couldn't you be discovering?
couldn't she be discovering?
couldn't we be discovering?
couldn't you be discovering?
couldn't they be discovering?

Perfect

couldn't I have discovered?
couldn't you have discovered?
couldn't she have discovered?
couldn't we have discovered?
couldn't you have discovered?
couldn't they have discovered?

V-ing perfect

couldn't I have been discovering?
couldn't you have been discovering?
couldn't she have been discovering?
couldn't we have been discovering?
couldn't you have been discovering?
couldn't they have been discovering?

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