Conjunctions that can sometimes be used in place of 'if

Conditionals can also be introduced by the following conjunctions, which do not always have precisely the same meaning as if. as long as, assuming (that), even if, if only [> 11.41-42], on (the) condition (that) provided/providing (that), so long as and unless [> 14.20]; also suppose (that) and supposing (that), which normally introduce questions:

He II definitely win, even if he falls over

They'll lend us their flat on (the) condition (that) we look after it

Providing/Provided (that) (or So/As long as) you clear your desk

Suppose/Supposing (that) we miss the train what shall we do?^?

What if and Say can be used in the sense of 'Let us suppose': What if/Say he gets home before us and can't get in? What will he do then? What if/Say you were to run out of money⁷ What would you do?

We can abbreviate a condition if we begin a new sentence with If so

In that case, or If not; or if we continue with in which case:

He may be busy, in which case I'll call later

or: He may be busy If so, (In that case,) III call later If not,

can I see him now⁷

Whether or not (Not *if or not*) introduces 'alternative' conditionals

[compare > 1.24.1, 15.18n7]:

Whether I feel well or not on Monday, I m going back to work Whether or not I feel well on Monday, I'm going back to work You'll have to put up with it, whether you like it or not