it emphasises that something will (or will not) happen, would (or would not) happen or would (or would not) have happened whatever the condition is/were.
if it weren’t for/if it hadn’t been for, but for
these expressions mean without; they are used in second and third conditionals and are usually followed by usually precede a noun phrase.
if in doubt, if possible, if necessary…
we can make the if-clause shorter, by omitting the subject and the verb be; in certain idiomatic expressions, the subject and be are normally omitted.
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