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 couldn't recur you couldn't recur he couldn't recur we couldn't recur you couldn't recur they couldn't recur	I couldn't be recurring you couldn't be recurring he couldn't be recurring we couldn't be recurring you couldn't be recurring they couldn't be recurring
Perfect	V-ing perfect
I couldn't have recurred you couldn't have recurred he couldn't have recurred we couldn't have recurred you couldn't have recurred they couldn't have recurred	I couldn't have been recurring you couldn't have been recurring he couldn't have been recurring we couldn't have been recurring you couldn't have been recurring they couldn't 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
couldn't I recur? couldn't you recur? couldn't he recur? couldn't we recur? couldn't you recur? couldn't they recur?	couldn't I be recurring? couldn't you be recurring? couldn't he be recurring? couldn't we be recurring? couldn't you be recurring? couldn't they be recurring?
Perfect	V-ing perfect
couldn't I have recurred? couldn't you have recurred? couldn't he have recurred? couldn't we have recurred? couldn't you have recurred? couldn't they have recurred?	couldn't I have been recurring? couldn't you have been recurring? couldn't he have been recurring? couldn't we have been recurring? couldn't you have been recurring? couldn't they have been recurring?