I could beat you could beat she could beat we could beat you could beat they could beat
V-ing form
I could be beating you could be beating she could be beating we could be beating you could be beating they could be beating
Perfect
I could have beaten, beat you could have beaten, beat she could have beaten, beat we could have beaten, beat you could have beaten, beat they could have beaten, beat
V-ing perfect
I could have been beating you could have been beating she could have been beating we could have been beating you could have been beating they could have been beating
Negation
Simple form
I could not beat you could not beat she could not beat we could not beat you could not beat they could not beat
V-ing form
I could not be beating you could not be beating she could not be beating we could not be beating you could not be beating they could not be beating
Perfect
I could not have beaten, beat you could not have beaten, beat she could not have beaten, beat we could not have beaten, beat you could not have beaten, beat they could not have beaten, beat
V-ing perfect
I could not have been beating you could not have been beating she could not have been beating we could not have been beating you could not have been beating they could not have been beating
Interrogative form
Simple form
could I beat? could you beat? could she beat? could we beat? could you beat? could they beat?
V-ing form
could I be beating? could you be beating? could she be beating? could we be beating? could you be beating? could they be beating?
Perfect
could I have beaten, beat? could you have beaten, beat? could she have beaten, beat? could we have beaten, beat? could you have beaten, beat? could they have beaten, beat?
V-ing perfect
could I have been beating? could you have been beating? could she have been beating? could we have been beating? could you have been beating? could they have been beating?
Interro-negative form
Simple form
could I not beat? could you not beat? could she not beat? could we not beat? could you not beat? could they not beat?
V-ing form
could I not be beating? could you not be beating? could she not be beating? could we not be beating? could you not be beating? could they not be beating?
Perfect
could I not have beaten, beat? could you not have beaten, beat? could she not have beaten, beat? could we not have beaten, beat? could you not have beaten, beat? could they not have beaten, beat?
V-ing perfect
could I not have been beating? could you not have been beating? could she not have been beating? could we not have been beating? could you not have been beating? could they not have been beating?