I could host you could host she could host we could host you could host they could host
V-ing form
I could be hosting you could be hosting she could be hosting we could be hosting you could be hosting they could be hosting
Perfect
I could have hosted you could have hosted she could have hosted we could have hosted you could have hosted they could have hosted
V-ing perfect
I could have been hosting you could have been hosting she could have been hosting we could have been hosting you could have been hosting they could have been hosting
Negation
Simple form
I couldn't host you couldn't host she couldn't host we couldn't host you couldn't host they couldn't host
V-ing form
I couldn't be hosting you couldn't be hosting she couldn't be hosting we couldn't be hosting you couldn't be hosting they couldn't be hosting
Perfect
I couldn't have hosted you couldn't have hosted she couldn't have hosted we couldn't have hosted you couldn't have hosted they couldn't have hosted
V-ing perfect
I couldn't have been hosting you couldn't have been hosting she couldn't have been hosting we couldn't have been hosting you couldn't have been hosting they couldn't have been hosting
Interrogative form
Simple form
could I host? could you host? could she host? could we host? could you host? could they host?
V-ing form
could I be hosting? could you be hosting? could she be hosting? could we be hosting? could you be hosting? could they be hosting?
Perfect
could I have hosted? could you have hosted? could she have hosted? could we have hosted? could you have hosted? could they have hosted?
V-ing perfect
could I have been hosting? could you have been hosting? could she have been hosting? could we have been hosting? could you have been hosting? could they have been hosting?
Interro-negative form
Simple form
couldn't I host? couldn't you host? couldn't she host? couldn't we host? couldn't you host? couldn't they host?
V-ing form
couldn't I be hosting? couldn't you be hosting? couldn't she be hosting? couldn't we be hosting? couldn't you be hosting? couldn't they be hosting?
Perfect
couldn't I have hosted? couldn't you have hosted? couldn't she have hosted? couldn't we have hosted? couldn't you have hosted? couldn't they have hosted?
V-ing perfect
couldn't I have been hosting? couldn't you have been hosting? couldn't she have been hosting? couldn't we have been hosting? couldn't you have been hosting? couldn't they have been hosting?