English verb conjugation
COULD SEVER

Regular verb: sever - severed - severed

Affirmation

Simple form	V-ing form
I could sever you could sever she could sever we could sever you could sever they could sever	I could be severing you could be severing she 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 she 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 she 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 couldn't sever you couldn't sever she couldn't sever we couldn't sever you couldn't sever they couldn't sever	I couldn't be severing you couldn't be severing she couldn't be severing we couldn't be severing you couldn't be severing they couldn't be severing
Perfect	V-ing perfect
I couldn't have severed you couldn't have severed she couldn't have severed we couldn't have severed you couldn't have severed they couldn't have severed	I couldn't have been severing you couldn't have been severing she couldn't have been severing we couldn't have been severing you couldn't have been severing they couldn't have been severing

Interrogative form

Simple form	V-ing form
could I sever? could you sever? could she sever? could we sever? could you sever? could they sever?	could I be severing? could you be severing? could she 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 she 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 she 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
couldn't I sever? couldn't you sever? couldn't she sever? couldn't we sever? couldn't you sever? couldn't they sever?	couldn't I be severing? couldn't you be severing? couldn't she be severing? couldn't we be severing? couldn't you be severing? couldn't they be severing?
Perfect	V-ing perfect
couldn't I have severed? couldn't you have severed? couldn't she have severed? couldn't we have severed? couldn't you have severed? couldn't they have severed?	couldn't I have been severing? couldn't you have been severing? couldn't she have been severing? couldn't we have been severing? couldn't you have been severing? couldn't they have been severing?