English verb conjugation
COULD SEVER

Regular verb: sever - severed - severed

Affirmation

Simple form	V-ing form
I could sever you could sever he could sever we could sever you could sever they could sever	I could be severing you could be severing he could be severing we could be severing you could be severing they could be severing
Perfect	V-ing perfect
I could have severed you could have severed he could have severed we could have severed you could have severed they could have severed	I could have been severing you could have been severing he could have been severing we could have been severing you could have been severing they could have been severing

Negation

Simple form	V-ing form
I could not sever you could not sever he could not sever we could not sever you could not sever they could not sever	I could not be severing you could not be severing he could not be severing we could not be severing you could not be severing they could not be severing
Perfect	V-ing perfect
I could not have severed you could not have severed he could not have severed we could not have severed you could not have severed they could not have severed	I could not have been severing you could not have been severing he could not have been severing we could not have been severing you could not have been severing they could not have been severing

Interrogative form

Simple form	V-ing form
could I sever? could you sever? could he sever? could we sever? could you sever? could they sever?	could I be severing? could you be severing? could he be severing? could we be severing? could you be severing? could they be severing?
Perfect	V-ing perfect
could I have severed? could you have severed? could he have severed? could we have severed? could you have severed? could they have severed?	could I have been severing? could you have been severing? could he have been severing? could we have been severing? could you have been severing? could they have been severing?

Interro-negative form

Simple form	V-ing form
could I not sever? could you not sever? could he not sever? could we not sever? could you not sever? could they not sever?	could I not be severing? could you not be severing? could he not be severing? could we not be severing? could you not be severing? could they not be severing?
Perfect	V-ing perfect
could I not have severed? could you not have severed? could he not have severed? could we not have severed? could you not have severed? could they not have severed?	could I not have been severing? could you not have been severing? could he not have been severing? could we not have been severing? could you not have been severing? could they not have been severing?