Inversion, a way to say " If you ever need", refers to a possible event in the future, The same as " If you happen to / If by any chance" , more formal, an imaginary situation might occur by accident, the situation is highly unlikely,testing the waters, , Inversion, an alternative to " If I had + V3 " , in the absence of, to express that a specific person or thing prevented smth from happening, Another way to say "assuming that", In this case IF cannot be used. To show that 2 alternatives are possible., " If.... not", " Except if ...", On the condition (that), Inversion, similar to " Had it not been for", but can be used referring to the Past or to the Present, means " if smth/smb didn't exist or without smth./smb.", similar to If it hadn't been for .

Conditionals, Proficiency Masterclass

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