English verb conjugation
COULD OVERTIGHTEN

Regular verb: overtighten - overtightened - overtightened

Affirmation

Simple form	V-ing form
I could overtighten you could overtighten he could overtighten we could overtighten you could overtighten they could overtighten	I could be overtightening you could be overtightening he 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 he 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 he 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 couldn't overtighten you couldn't overtighten he couldn't overtighten we couldn't overtighten you couldn't overtighten they couldn't overtighten	I couldn't be overtightening you couldn't be overtightening he couldn't be overtightening we couldn't be overtightening you couldn't be overtightening they couldn't be overtightening
Perfect	V-ing perfect
I couldn't have overtightened you couldn't have overtightened he couldn't have overtightened we couldn't have overtightened you couldn't have overtightened they couldn't have overtightened	I couldn't have been overtightening you couldn't have been overtightening he couldn't have been overtightening we couldn't have been overtightening you couldn't have been overtightening they couldn't have been overtightening

Interrogative form

Simple form	V-ing form
could I overtighten? could you overtighten? could he overtighten? could we overtighten? could you overtighten? could they overtighten?	could I be overtightening? could you be overtightening? could he 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 he 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 he 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
couldn't I overtighten? couldn't you overtighten? couldn't he overtighten? couldn't we overtighten? couldn't you overtighten? couldn't they overtighten?	couldn't I be overtightening? couldn't you be overtightening? couldn't he be overtightening? couldn't we be overtightening? couldn't you be overtightening? couldn't they be overtightening?
Perfect	V-ing perfect
couldn't I have overtightened? couldn't you have overtightened? couldn't he have overtightened? couldn't we have overtightened? couldn't you have overtightened? couldn't they have overtightened?	couldn't I have been overtightening? couldn't you have been overtightening? couldn't he have been overtightening? couldn't we have been overtightening? couldn't you have been overtightening? couldn't they have been overtightening?