But it would also be possible to say "one is supposed to help one's brothers" as a general statement, wouldn't it? In this context, "sollst" and "solltest" can be used interchangeably, but they actually different things. I could also say "Man sollte seinen Brüdern schon helfen" as I could say "Du sollst deinen Brüdern helfen" (which sounds like the Eleventh Commandment )elroy said:No, I did not mean "solltest" - but rather "sollst."
"Solltest" would mean that it's my opinion - I think you should help your brothers.
"Sollst" expresses a universal moral obligation - one "should" help one's brothers.