English verb conjugation
COULD CHAIR

Regular verb: chair - chaired - chaired

Affirmation

Simple form	V-ing form
I could chair you could chair he could chair we could chair you could chair they could chair	I could be chairing you could be chairing he could be chairing we could be chairing you could be chairing they could be chairing
Perfect	V-ing perfect
I could have chaired you could have chaired he could have chaired we could have chaired you could have chaired they could have chaired	I could have been chairing you could have been chairing he could have been chairing we could have been chairing you could have been chairing they could have been chairing

Negation

Simple form	V-ing form
I could not chair you could not chair he could not chair we could not chair you could not chair they could not chair	I could not be chairing you could not be chairing he could not be chairing we could not be chairing you could not be chairing they could not be chairing
Perfect	V-ing perfect
I could not have chaired you could not have chaired he could not have chaired we could not have chaired you could not have chaired they could not have chaired	I could not have been chairing you could not have been chairing he could not have been chairing we could not have been chairing you could not have been chairing they could not have been chairing

Interrogative form

Simple form	V-ing form
could I chair? could you chair? could he chair? could we chair? could you chair? could they chair?	could I be chairing? could you be chairing? could he be chairing? could we be chairing? could you be chairing? could they be chairing?
Perfect	V-ing perfect
could I have chaired? could you have chaired? could he have chaired? could we have chaired? could you have chaired? could they have chaired?	could I have been chairing? could you have been chairing? could he have been chairing? could we have been chairing? could you have been chairing? could they have been chairing?

Interro-negative form

Simple form	V-ing form
could I not chair? could you not chair? could he not chair? could we not chair? could you not chair? could they not chair?	could I not be chairing? could you not be chairing? could he not be chairing? could we not be chairing? could you not be chairing? could they not be chairing?
Perfect	V-ing perfect
could I not have chaired? could you not have chaired? could he not have chaired? could we not have chaired? could you not have chaired? could they not have chaired?	could I not have been chairing? could you not have been chairing? could he not have been chairing? could we not have been chairing? could you not have been chairing? could they not have been chairing?