I could bestead you could bestead she could bestead we could bestead you could bestead they could bestead
V-ing form
I could be besteading you could be besteading she could be besteading we could be besteading you could be besteading they could be besteading
Perfect
I could have besteaded you could have besteaded she could have besteaded we could have besteaded you could have besteaded they could have besteaded
V-ing perfect
I could have been besteading you could have been besteading she could have been besteading we could have been besteading you could have been besteading they could have been besteading
Negation
Simple form
I could not bestead you could not bestead she could not bestead we could not bestead you could not bestead they could not bestead
V-ing form
I could not be besteading you could not be besteading she could not be besteading we could not be besteading you could not be besteading they could not be besteading
Perfect
I could not have besteaded you could not have besteaded she could not have besteaded we could not have besteaded you could not have besteaded they could not have besteaded
V-ing perfect
I could not have been besteading you could not have been besteading she could not have been besteading we could not have been besteading you could not have been besteading they could not have been besteading
Interrogative form
Simple form
could I bestead? could you bestead? could she bestead? could we bestead? could you bestead? could they bestead?
V-ing form
could I be besteading? could you be besteading? could she be besteading? could we be besteading? could you be besteading? could they be besteading?
Perfect
could I have besteaded? could you have besteaded? could she have besteaded? could we have besteaded? could you have besteaded? could they have besteaded?
V-ing perfect
could I have been besteading? could you have been besteading? could she have been besteading? could we have been besteading? could you have been besteading? could they have been besteading?
Interro-negative form
Simple form
could I not bestead? could you not bestead? could she not bestead? could we not bestead? could you not bestead? could they not bestead?
V-ing form
could I not be besteading? could you not be besteading? could she not be besteading? could we not be besteading? could you not be besteading? could they not be besteading?
Perfect
could I not have besteaded? could you not have besteaded? could she not have besteaded? could we not have besteaded? could you not have besteaded? could they not have besteaded?
V-ing perfect
could I not have been besteading? could you not have been besteading? could she not have been besteading? could we not have been besteading? could you not have been besteading? could they not have been besteading?