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 couldn't beat you couldn't beat she couldn't beat we couldn't beat you couldn't beat they couldn't beat
V-ing form
I couldn't be beating you couldn't be beating she couldn't be beating we couldn't be beating you couldn't be beating they couldn't be beating
Perfect
I couldn't have beaten, beat you couldn't have beaten, beat she couldn't have beaten, beat we couldn't have beaten, beat you couldn't have beaten, beat they couldn't have beaten, beat
V-ing perfect
I couldn't have been beating you couldn't have been beating she couldn't have been beating we couldn't have been beating you couldn't have been beating they couldn't 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
couldn't I beat? couldn't you beat? couldn't she beat? couldn't we beat? couldn't you beat? couldn't they beat?
V-ing form
couldn't I be beating? couldn't you be beating? couldn't she be beating? couldn't we be beating? couldn't you be beating? couldn't they be beating?
Perfect
couldn't I have beaten, beat? couldn't you have beaten, beat? couldn't she have beaten, beat? couldn't we have beaten, beat? couldn't you have beaten, beat? couldn't they have beaten, beat?
V-ing perfect
couldn't I have been beating? couldn't you have been beating? couldn't she have been beating? couldn't we have been beating? couldn't you have been beating? couldn't they have been beating?