English verb conjugation
COULD RECUR

Regular verb: recur - recurred - recurred

Affirmation

Simple form	V-ing form
I could recur you could recur he could recur we could recur you could recur they could recur	I could be recurring you could be recurring he could be recurring we could be recurring you could be recurring they could be recurring
Perfect	V-ing perfect
I could have recurred you could have recurred he could have recurred we could have recurred you could have recurred they could have recurred	I could have been recurring you could have been recurring he could have been recurring we could have been recurring you could have been recurring they could have been recurring

Negation

Simple form	V-ing form
I could not recur you could not recur he could not recur we could not recur you could not recur they could not recur	I could not be recurring you could not be recurring he could not be recurring we could not be recurring you could not be recurring they could not be recurring
Perfect	V-ing perfect
I could not have recurred you could not have recurred he could not have recurred we could not have recurred you could not have recurred they could not have recurred	I could not have been recurring you could not have been recurring he could not have been recurring we could not have been recurring you could not have been recurring they could not have been recurring

Interrogative form

Simple form	V-ing form
could I recur? could you recur? could he recur? could we recur? could you recur? could they recur?	could I be recurring? could you be recurring? could he be recurring? could we be recurring? could you be recurring? could they be recurring?
Perfect	V-ing perfect
could I have recurred? could you have recurred? could he have recurred? could we have recurred? could you have recurred? could they have recurred?	could I have been recurring? could you have been recurring? could he have been recurring? could we have been recurring? could you have been recurring? could they have been recurring?

Interro-negative form

Simple form	V-ing form
could I not recur? could you not recur? could he not recur? could we not recur? could you not recur? could they not recur?	could I not be recurring? could you not be recurring? could he not be recurring? could we not be recurring? could you not be recurring? could they not be recurring?
Perfect	V-ing perfect
could I not have recurred? could you not have recurred? could he not have recurred? could we not have recurred? could you not have recurred? could they not have recurred?	could I not have been recurring? could you not have been recurring? could he not have been recurring? could we not have been recurring? could you not have been recurring? could they not have been recurring?