---

Abstract
After scrutiny the problem of time in Persian verbs, the writers of present essay proceed to revise the usage of auxiliary and modal verbs and by putting forward and criticizing the paroles of writers of Grammar about this subject, reject the difference of these two verbs and expressing the similarities of them in language and showing that modal and auxiliary verbs have the same usage; Then by presenting the verb 'willing' as auxiliary (but not modal) verb in verbs like "would to go" and "was going to go" and etc. putting forward the existence of the time of "future in the past" in Persian language and compering it with some time with the same name in English language. The writers believe that the time "future in the past" is not only a time but in combination with other times it can create some new times in it's subset.

 

---

Potential treatment risks refer to those risks that concern treatment measures in its strict sense, and these risks must not be predictable at the time of concluding the treatment contract between the physician and patient. Of course, the conventional meaning of these risks relates to the situation in which its arrival is neither that of the doctor’s default, nor that of the patient’s default. In this paper, the reasons behind the recoverability of potential treatment risks were analyzed, and we came to the conclusion that, on the one hand, the doctor is not liable for these risks because of the observance the scientific standards and conventional manners of doctors during special conditions and circumstances of treatment, and like France, there should be taken into account some special provisions in Iran’s law, and on the other hand, on the subject of compensating patients for unjust losses in this respect, since they (patients) have not defaulted in the course of incurring these losses, it would be reasonable that the Iranian legislator protects the patients’ interests by establishing “a security fund related to compensating aggrieved people due to terrorist activities, crimes and accidents whose causes are unknown or it’s impossible to get blood money from the harming party for any reason”, just like France’s law in which such losses are recoverable from a specific security fund by complying with special conditions and formalities.