English verb conjugation
COULD CONCUR

Regular verb: concur - concurred - concurred

Affirmation

Simple form	V-ing form
I could concur you could concur he could concur we could concur you could concur they could concur	I could be concurring you could be concurring he could be concurring we could be concurring you could be concurring they could be concurring
Perfect	V-ing perfect
I could have concurred you could have concurred he could have concurred we could have concurred you could have concurred they could have concurred	I could have been concurring you could have been concurring he could have been concurring we could have been concurring you could have been concurring they could have been concurring

Negation

Simple form	V-ing form
I could not concur you could not concur he could not concur we could not concur you could not concur they could not concur	I could not be concurring you could not be concurring he could not be concurring we could not be concurring you could not be concurring they could not be concurring
Perfect	V-ing perfect
I could not have concurred you could not have concurred he could not have concurred we could not have concurred you could not have concurred they could not have concurred	I could not have been concurring you could not have been concurring he could not have been concurring we could not have been concurring you could not have been concurring they could not have been concurring

Interrogative form

Simple form	V-ing form
could I concur? could you concur? could he concur? could we concur? could you concur? could they concur?	could I be concurring? could you be concurring? could he be concurring? could we be concurring? could you be concurring? could they be concurring?
Perfect	V-ing perfect
could I have concurred? could you have concurred? could he have concurred? could we have concurred? could you have concurred? could they have concurred?	could I have been concurring? could you have been concurring? could he have been concurring? could we have been concurring? could you have been concurring? could they have been concurring?

Interro-negative form

Simple form	V-ing form
could I not concur? could you not concur? could he not concur? could we not concur? could you not concur? could they not concur?	could I not be concurring? could you not be concurring? could he not be concurring? could we not be concurring? could you not be concurring? could they not be concurring?
Perfect	V-ing perfect
could I not have concurred? could you not have concurred? could he not have concurred? could we not have concurred? could you not have concurred? could they not have concurred?	could I not have been concurring? could you not have been concurring? could he not have been concurring? could we not have been concurring? could you not have been concurring? could they not have been concurring?