English verb conjugation
COULD OVERTIGHTEN

Regular verb: overtighten - overtightened - overtightened

Affirmation

Simple form	V-ing form
I could overtighten you could overtighten she could overtighten we could overtighten you could overtighten they could overtighten	I could be overtightening you could be overtightening she could be overtightening we could be overtightening you could be overtightening they could be overtightening
Perfect	V-ing perfect
I could have overtightened you could have overtightened she could have overtightened we could have overtightened you could have overtightened they could have overtightened	I could have been overtightening you could have been overtightening she could have been overtightening we could have been overtightening you could have been overtightening they could have been overtightening

Negation

Simple form	V-ing form
I could not overtighten you could not overtighten she could not overtighten we could not overtighten you could not overtighten they could not overtighten	I could not be overtightening you could not be overtightening she could not be overtightening we could not be overtightening you could not be overtightening they could not be overtightening
Perfect	V-ing perfect
I could not have overtightened you could not have overtightened she could not have overtightened we could not have overtightened you could not have overtightened they could not have overtightened	I could not have been overtightening you could not have been overtightening she could not have been overtightening we could not have been overtightening you could not have been overtightening they could not have been overtightening

Interrogative form

Simple form	V-ing form
could I overtighten? could you overtighten? could she overtighten? could we overtighten? could you overtighten? could they overtighten?	could I be overtightening? could you be overtightening? could she be overtightening? could we be overtightening? could you be overtightening? could they be overtightening?
Perfect	V-ing perfect
could I have overtightened? could you have overtightened? could she have overtightened? could we have overtightened? could you have overtightened? could they have overtightened?	could I have been overtightening? could you have been overtightening? could she have been overtightening? could we have been overtightening? could you have been overtightening? could they have been overtightening?

Interro-negative form

Simple form	V-ing form
could I not overtighten? could you not overtighten? could she not overtighten? could we not overtighten? could you not overtighten? could they not overtighten?	could I not be overtightening? could you not be overtightening? could she not be overtightening? could we not be overtightening? could you not be overtightening? could they not be overtightening?
Perfect	V-ing perfect
could I not have overtightened? could you not have overtightened? could she not have overtightened? could we not have overtightened? could you not have overtightened? could they not have overtightened?	could I not have been overtightening? could you not have been overtightening? could she not have been overtightening? could we not have been overtightening? could you not have been overtightening? could they not have been overtightening?