Go/Capturing exercise

Hone your ability to recognize capturable stones and groups here. For each of these diagrams, say if either player can capture and if so, where he'd have to play to do so. ul u u u ur l b b r l b w b r l r dl d d d dr 24 ul u u u ur l r l w w w l b dl d d d w 24 ul u u u ur l r l r b r w d d d dr 24 ul u u u ur l b b r l w w b l b b r dl d d d dr 24 ul u u u ur l b b l w w l w b b dl d d d dr 24 ul u u u ur l b b b l w w l w b r dl d d d dr 24