English verb conjugation
COULD UNLOCK

Regular verb: unlock - unlocked - unlocked

Affirmation

Simple form	V-ing form
I could unlock you could unlock she could unlock we could unlock you could unlock they could unlock	I could be unlocking you could be unlocking she could be unlocking we could be unlocking you could be unlocking they could be unlocking
Perfect	V-ing perfect
I could have unlocked you could have unlocked she could have unlocked we could have unlocked you could have unlocked they could have unlocked	I could have been unlocking you could have been unlocking she could have been unlocking we could have been unlocking you could have been unlocking they could have been unlocking

Negation

Simple form	V-ing form
I couldn't unlock you couldn't unlock she couldn't unlock we couldn't unlock you couldn't unlock they couldn't unlock	I couldn't be unlocking you couldn't be unlocking she couldn't be unlocking we couldn't be unlocking you couldn't be unlocking they couldn't be unlocking
Perfect	V-ing perfect
I couldn't have unlocked you couldn't have unlocked she couldn't have unlocked we couldn't have unlocked you couldn't have unlocked they couldn't have unlocked	I couldn't have been unlocking you couldn't have been unlocking she couldn't have been unlocking we couldn't have been unlocking you couldn't have been unlocking they couldn't have been unlocking

Interrogative form

Simple form	V-ing form
could I unlock? could you unlock? could she unlock? could we unlock? could you unlock? could they unlock?	could I be unlocking? could you be unlocking? could she be unlocking? could we be unlocking? could you be unlocking? could they be unlocking?
Perfect	V-ing perfect
could I have unlocked? could you have unlocked? could she have unlocked? could we have unlocked? could you have unlocked? could they have unlocked?	could I have been unlocking? could you have been unlocking? could she have been unlocking? could we have been unlocking? could you have been unlocking? could they have been unlocking?

Interro-negative form

Simple form	V-ing form
couldn't I unlock? couldn't you unlock? couldn't she unlock? couldn't we unlock? couldn't you unlock? couldn't they unlock?	couldn't I be unlocking? couldn't you be unlocking? couldn't she be unlocking? couldn't we be unlocking? couldn't you be unlocking? couldn't they be unlocking?
Perfect	V-ing perfect
couldn't I have unlocked? couldn't you have unlocked? couldn't she have unlocked? couldn't we have unlocked? couldn't you have unlocked? couldn't they have unlocked?	couldn't I have been unlocking? couldn't you have been unlocking? couldn't she have been unlocking? couldn't we have been unlocking? couldn't you have been unlocking? couldn't they have been unlocking?