English verb conjugation
COULD CONCUR

Regular verb: concur - concurred - concurred

Affirmation

Simple form	V-ing form
I could concur you could concur she could concur we could concur you could concur they could concur	I could be concurring you could be concurring she 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 she 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 she 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 couldn't concur you couldn't concur she couldn't concur we couldn't concur you couldn't concur they couldn't concur	I couldn't be concurring you couldn't be concurring she couldn't be concurring we couldn't be concurring you couldn't be concurring they couldn't be concurring
Perfect	V-ing perfect
I couldn't have concurred you couldn't have concurred she couldn't have concurred we couldn't have concurred you couldn't have concurred they couldn't have concurred	I couldn't have been concurring you couldn't have been concurring she couldn't have been concurring we couldn't have been concurring you couldn't have been concurring they couldn't have been concurring

Interrogative form

Simple form	V-ing form
could I concur? could you concur? could she concur? could we concur? could you concur? could they concur?	could I be concurring? could you be concurring? could she 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 she 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 she 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
couldn't I concur? couldn't you concur? couldn't she concur? couldn't we concur? couldn't you concur? couldn't they concur?	couldn't I be concurring? couldn't you be concurring? couldn't she be concurring? couldn't we be concurring? couldn't you be concurring? couldn't they be concurring?
Perfect	V-ing perfect
couldn't I have concurred? couldn't you have concurred? couldn't she have concurred? couldn't we have concurred? couldn't you have concurred? couldn't they have concurred?	couldn't I have been concurring? couldn't you have been concurring? couldn't she have been concurring? couldn't we have been concurring? couldn't you have been concurring? couldn't they have been concurring?