English verb conjugation
COULD UNBOLT

Regular verb: unbolt - unbolted - unbolted

Affirmation

Simple form	V-ing form
I could unbolt you could unbolt he could unbolt we could unbolt you could unbolt they could unbolt	I could be unbolting you could be unbolting he could be unbolting we could be unbolting you could be unbolting they could be unbolting
Perfect	V-ing perfect
I could have unbolted you could have unbolted he could have unbolted we could have unbolted you could have unbolted they could have unbolted	I could have been unbolting you could have been unbolting he could have been unbolting we could have been unbolting you could have been unbolting they could have been unbolting

Negation

Simple form	V-ing form
I couldn't unbolt you couldn't unbolt he couldn't unbolt we couldn't unbolt you couldn't unbolt they couldn't unbolt	I couldn't be unbolting you couldn't be unbolting he couldn't be unbolting we couldn't be unbolting you couldn't be unbolting they couldn't be unbolting
Perfect	V-ing perfect
I couldn't have unbolted you couldn't have unbolted he couldn't have unbolted we couldn't have unbolted you couldn't have unbolted they couldn't have unbolted	I couldn't have been unbolting you couldn't have been unbolting he couldn't have been unbolting we couldn't have been unbolting you couldn't have been unbolting they couldn't have been unbolting

Interrogative form

Simple form	V-ing form
could I unbolt? could you unbolt? could he unbolt? could we unbolt? could you unbolt? could they unbolt?	could I be unbolting? could you be unbolting? could he be unbolting? could we be unbolting? could you be unbolting? could they be unbolting?
Perfect	V-ing perfect
could I have unbolted? could you have unbolted? could he have unbolted? could we have unbolted? could you have unbolted? could they have unbolted?	could I have been unbolting? could you have been unbolting? could he have been unbolting? could we have been unbolting? could you have been unbolting? could they have been unbolting?

Interro-negative form

Simple form	V-ing form
couldn't I unbolt? couldn't you unbolt? couldn't he unbolt? couldn't we unbolt? couldn't you unbolt? couldn't they unbolt?	couldn't I be unbolting? couldn't you be unbolting? couldn't he be unbolting? couldn't we be unbolting? couldn't you be unbolting? couldn't they be unbolting?
Perfect	V-ing perfect
couldn't I have unbolted? couldn't you have unbolted? couldn't he have unbolted? couldn't we have unbolted? couldn't you have unbolted? couldn't they have unbolted?	couldn't I have been unbolting? couldn't you have been unbolting? couldn't he have been unbolting? couldn't we have been unbolting? couldn't you have been unbolting? couldn't they have been unbolting?