English verb conjugation
COULD TENON

Regular verb: tenon - tenoned - tenoned

Affirmation

Simple form	V-ing form
I could tenon you could tenon she could tenon we could tenon you could tenon they could tenon	I could be tenoning you could be tenoning she could be tenoning we could be tenoning you could be tenoning they could be tenoning
Perfect	V-ing perfect
I could have tenoned you could have tenoned she could have tenoned we could have tenoned you could have tenoned they could have tenoned	I could have been tenoning you could have been tenoning she could have been tenoning we could have been tenoning you could have been tenoning they could have been tenoning

Negation

Simple form	V-ing form
I could not tenon you could not tenon she could not tenon we could not tenon you could not tenon they could not tenon	I could not be tenoning you could not be tenoning she could not be tenoning we could not be tenoning you could not be tenoning they could not be tenoning
Perfect	V-ing perfect
I could not have tenoned you could not have tenoned she could not have tenoned we could not have tenoned you could not have tenoned they could not have tenoned	I could not have been tenoning you could not have been tenoning she could not have been tenoning we could not have been tenoning you could not have been tenoning they could not have been tenoning

Interrogative form

Simple form	V-ing form
could I tenon? could you tenon? could she tenon? could we tenon? could you tenon? could they tenon?	could I be tenoning? could you be tenoning? could she be tenoning? could we be tenoning? could you be tenoning? could they be tenoning?
Perfect	V-ing perfect
could I have tenoned? could you have tenoned? could she have tenoned? could we have tenoned? could you have tenoned? could they have tenoned?	could I have been tenoning? could you have been tenoning? could she have been tenoning? could we have been tenoning? could you have been tenoning? could they have been tenoning?

Interro-negative form

Simple form	V-ing form
could I not tenon? could you not tenon? could she not tenon? could we not tenon? could you not tenon? could they not tenon?	could I not be tenoning? could you not be tenoning? could she not be tenoning? could we not be tenoning? could you not be tenoning? could they not be tenoning?
Perfect	V-ing perfect
could I not have tenoned? could you not have tenoned? could she not have tenoned? could we not have tenoned? could you not have tenoned? could they not have tenoned?	could I not have been tenoning? could you not have been tenoning? could she not have been tenoning? could we not have been tenoning? could you not have been tenoning? could they not have been tenoning?