I could stride you could stride he could stride we could stride you could stride they could stride
V-ing form
I could be striding you could be striding he could be striding we could be striding you could be striding they could be striding
Perfect
I could have stridden you could have stridden he could have stridden we could have stridden you could have stridden they could have stridden
V-ing perfect
I could have been striding you could have been striding he could have been striding we could have been striding you could have been striding they could have been striding
Negation
Simple form
I could not stride you could not stride he could not stride we could not stride you could not stride they could not stride
V-ing form
I could not be striding you could not be striding he could not be striding we could not be striding you could not be striding they could not be striding
Perfect
I could not have stridden you could not have stridden he could not have stridden we could not have stridden you could not have stridden they could not have stridden
V-ing perfect
I could not have been striding you could not have been striding he could not have been striding we could not have been striding you could not have been striding they could not have been striding
Interrogative form
Simple form
could I stride? could you stride? could he stride? could we stride? could you stride? could they stride?
V-ing form
could I be striding? could you be striding? could he be striding? could we be striding? could you be striding? could they be striding?
Perfect
could I have stridden? could you have stridden? could he have stridden? could we have stridden? could you have stridden? could they have stridden?
V-ing perfect
could I have been striding? could you have been striding? could he have been striding? could we have been striding? could you have been striding? could they have been striding?
Interro-negative form
Simple form
could I not stride? could you not stride? could he not stride? could we not stride? could you not stride? could they not stride?
V-ing form
could I not be striding? could you not be striding? could he not be striding? could we not be striding? could you not be striding? could they not be striding?
Perfect
could I not have stridden? could you not have stridden? could he not have stridden? could we not have stridden? could you not have stridden? could they not have stridden?
V-ing perfect
could I not have been striding? could you not have been striding? could he not have been striding? could we not have been striding? could you not have been striding? could they not have been striding?