He ought to be studying for his exam. He shouldn’t be spending all his time on the beach; We should be wearing seat belts, (But we are not wearing them); I shouldn’t be telling you this. It’s supposed to be a secret.
[ought/should con el infinitivo continuo expresan la idea de que el sujeto no está cumpliendo con la obligación, o de que está actuando necia o precipitadamente, o sin sensatez o prudencia.]
A Practical English Grammar (A.J. Thomson & A.V. Martinet) 