i) The 'Future in the Past' as you call it is the Past Unreal Conditional: The rule for this is: (If... past perfect..., would have + past participle) If I had asked people what they wanted, they would have said 'foster horses' ii) 'possibility' is the 'Imaginary Present' conditional The rule for this is: (If ... past simple..., would + base verb) If I had you, life would be a party, it'd be ecstasy. Your third point is not grammatically correct: A : I guess, you better don't get to the office tomorrow. B : But if the boss had called and asked me about the sale, what would I say then? Perhaps it should be: A: I guess, you better not go to the office tomorrow. B: But if the boss calls and asks me about the sale, what will I say then? B uses the first conditional form (connecting two future actions) present simple......, will + base verb If the boss calls and asks me about the sale, what would I say then? This website may help: http://www.usingenglish.com/articles/english-conditionals-an-introduction.html

Well, none of them actually have future in the past. The first example is third conditional - a complete re-imagining of the past (ie. none of what is written actually happened). The second example (which is badly written) is second conditional. This would fit the category of ''possibility'', but the possibility is unlikely... or at best, unsure. The third example is very poorly written and unnatural. It's roughly ''possibiliity'', but the second conditional structure in it is a mess. An example of ''future in the past'' would be in reported speech: ''He saıd he would see me tomorrow.''