English has expresses advice in the present and past through the use of the following modal constructions:
- present: You should [...]
- present negated: You shouldn't [...]
- past: You should have [...]
- past negated: You shouldn't have [...]
I am somewhat unsure about how to express either of these in Latin. My gut feeling for expressing the present modalities is to simply use the present subjunctive, e.g:
rogēs eum ut faciat prō tē illud -- you should ask him to do that for you
nōn trānseās illud flūmen, mī amīce -- you should not cross that river, my friend
However, when it comes to expressing the past modality, I am lost. I am not even sure if the other three subjunctive tenses would work to express this.
How would one go about expressing the modalities of advice, listed above, in Latin?