I could fear you could fear he could fear we could fear you could fear they could fear
V-ing form
I could be fearing you could be fearing he could be fearing we could be fearing you could be fearing they could be fearing
Perfect
I could have feared you could have feared he could have feared we could have feared you could have feared they could have feared
V-ing perfect
I could have been fearing you could have been fearing he could have been fearing we could have been fearing you could have been fearing they could have been fearing
Negation
Simple form
I could not fear you could not fear he could not fear we could not fear you could not fear they could not fear
V-ing form
I could not be fearing you could not be fearing he could not be fearing we could not be fearing you could not be fearing they could not be fearing
Perfect
I could not have feared you could not have feared he could not have feared we could not have feared you could not have feared they could not have feared
V-ing perfect
I could not have been fearing you could not have been fearing he could not have been fearing we could not have been fearing you could not have been fearing they could not have been fearing
Interrogative form
Simple form
could I fear? could you fear? could he fear? could we fear? could you fear? could they fear?
V-ing form
could I be fearing? could you be fearing? could he be fearing? could we be fearing? could you be fearing? could they be fearing?
Perfect
could I have feared? could you have feared? could he have feared? could we have feared? could you have feared? could they have feared?
V-ing perfect
could I have been fearing? could you have been fearing? could he have been fearing? could we have been fearing? could you have been fearing? could they have been fearing?
Interro-negative form
Simple form
could I not fear? could you not fear? could he not fear? could we not fear? could you not fear? could they not fear?
V-ing form
could I not be fearing? could you not be fearing? could he not be fearing? could we not be fearing? could you not be fearing? could they not be fearing?
Perfect
could I not have feared? could you not have feared? could he not have feared? could we not have feared? could you not have feared? could they not have feared?
V-ing perfect
could I not have been fearing? could you not have been fearing? could he not have been fearing? could we not have been fearing? could you not have been fearing? could they not have been fearing?