English verb conjugation
COULD UNLATCH

Regular verb: unlatch - unlatched - unlatched

Affirmation

Simple form	V-ing form
I could unlatch you could unlatch he could unlatch we could unlatch you could unlatch they could unlatch	I could be unlatching you could be unlatching he could be unlatching we could be unlatching you could be unlatching they could be unlatching
Perfect	V-ing perfect
I could have unlatched you could have unlatched he could have unlatched we could have unlatched you could have unlatched they could have unlatched	I could have been unlatching you could have been unlatching he could have been unlatching we could have been unlatching you could have been unlatching they could have been unlatching

Negation

Simple form	V-ing form
I couldn't unlatch you couldn't unlatch he couldn't unlatch we couldn't unlatch you couldn't unlatch they couldn't unlatch	I couldn't be unlatching you couldn't be unlatching he couldn't be unlatching we couldn't be unlatching you couldn't be unlatching they couldn't be unlatching
Perfect	V-ing perfect
I couldn't have unlatched you couldn't have unlatched he couldn't have unlatched we couldn't have unlatched you couldn't have unlatched they couldn't have unlatched	I couldn't have been unlatching you couldn't have been unlatching he couldn't have been unlatching we couldn't have been unlatching you couldn't have been unlatching they couldn't have been unlatching

Interrogative form

Simple form	V-ing form
could I unlatch? could you unlatch? could he unlatch? could we unlatch? could you unlatch? could they unlatch?	could I be unlatching? could you be unlatching? could he be unlatching? could we be unlatching? could you be unlatching? could they be unlatching?
Perfect	V-ing perfect
could I have unlatched? could you have unlatched? could he have unlatched? could we have unlatched? could you have unlatched? could they have unlatched?	could I have been unlatching? could you have been unlatching? could he have been unlatching? could we have been unlatching? could you have been unlatching? could they have been unlatching?

Interro-negative form

Simple form	V-ing form
couldn't I unlatch? couldn't you unlatch? couldn't he unlatch? couldn't we unlatch? couldn't you unlatch? couldn't they unlatch?	couldn't I be unlatching? couldn't you be unlatching? couldn't he be unlatching? couldn't we be unlatching? couldn't you be unlatching? couldn't they be unlatching?
Perfect	V-ing perfect
couldn't I have unlatched? couldn't you have unlatched? couldn't he have unlatched? couldn't we have unlatched? couldn't you have unlatched? couldn't they have unlatched?	couldn't I have been unlatching? couldn't you have been unlatching? couldn't he have been unlatching? couldn't we have been unlatching? couldn't you have been unlatching? couldn't they have been unlatching?