Употребление will после if

Все мы знаем, что после if нельзя употреблять will, если речь идет о будущем времени. Но бывают и исключения. Рассмотрим случаи употребления if и will в одном предложении.

1. "whether" not condition — "ли", отсутствие условия.

If может иметь два значения.
Первое значение: "если". Когда слово if означает "если". If you ask me to leave I can leave.

Второе значение: "ли". I am not sure if I will stay there longer. Во этом случае употребление will допустимо.

2. a) an emphasis on a result — акцент на результат.
In the condition, meaning “indeed”, certainly, well to be done.
He'll pay me $10 if I'll help him do the dishes. (Doing the dishes is the result of paying ten dollars:
He'll pay me $10 if I well / indeed help him do the dishes.)

b) ’echoic', reflecting a previous speaker's — повторение фразы за кем-то.
Use of will, indicating that it is the truth:
John will be here tomorrow. — Well, if John will be here tomorrow we'd better get that presentation done tonight. (Well, if John is well / indeed here tomorrow we'd better get that presentation done tonight.)

c) when will is used to indicate an inherent quality or capacity — для обозначения свойственного качества или способности.
If your car will hold all of us I don't need to take mine. (If your car well / indeed holds all of us I don't need to take mine.)

3. a polite request — вежливая просьба
If you will send me an email now, I will consider your business proposition as soon as possible.

4. a refusal with "not" (WON’T) — отказ с "not"
If he won’t sign a document, I will have to look for another way out.

5. meaning to wish, want, allow — в значении "хотеть", "позволять".
He wasn't a very honest person, a liar if you will.

6. a willingness, intention, obstinate insistence for emphasis — желание, намерение, упрямая настойчивость для акцента.
If you will keep bothering me with questions you will hear some answers you don't like.
If he'll listen to me I'll be able to help him. (If he is willing to listen...)