Will and Would in the ‘If-clauses’

The general rule says: we don’t use will and would in the if-clauses

We use would like in the if-clause if the meaning is similar to want.
E.g. If you would like to sit down, please help yourself to a seat.

We use will in the if-clause if the meaning is similar to be prepared to or be willing to.
E.g. If you will wait a minute, the doctor will come and see you.

We use will and would in the if-clause to suggest perverse and deliberate behavior (and they are normally stressed).
E.g. If you will argue with everyone, you can’t expect to be popular.
       If you wouldn’t take so much time off, you might earn more.