Sasha, There are two main branches of the English Language, British English and American English. The two variations differ slightly in their treatment of conditional and subjunctive forms. With just a little exposure to the other variation, native speakers have no problem communicating with those on the other side of the Atlantic. It presents a larger problem, however, for non-native speakers. Russian linguists have placed these different usages into a single category called the oblique mood for the purpose of studying English as an international language. It is a very pratical approach but does not correspond to the way these forms are learned in America or England. It may represent a grammar for the future if English continues to be the world's lingua franca.

The subjunctive in the present system is a formal category, as distinguished from the old categorization which, semantic as it apparently is, used to cover all the verb forms that express assumptions contrary to the given fact or not likely to be materialized, and becomes a far less important verbal category than was suggested. what usd to be expressed by means of the formally indistinctive subjunctive mood is now chiefly expressed by means of modal auxiliaries, past tense forms, past perfect forms.

What is your point? Anyway, it is felt as unnecessary to go into the subjunctive stuff when learning English. That is the way of grammar books these days. I don't know why.