 And the opposite of the plagal motion would be up a fifth, perfect fifth, and again the chords would be major or minor, B flat, F. Use the circle of fifths to help you out. We can also precede our target chord with a 5 which is called the secondary dominant 5 of the 1, 5 of the 1, and lastly we can add some 2-5-1 flavor preceding each of these chords.