As long as, provided, providing
As long as, provided and providing are subordinating conjunctions. They express condition and are used at the beginning of a subordinate clause.
|As long as|
|We use as long as to express a condition, i.e. to say that something will happen only on condition that something else happens.||I'll lend you the book as long as you promise to give me it back next week.
(= If you don't promise to give the book back next week, I will not lend you it.)
|As long as expresses that one thing depends on another.||You can go to the party as long as you come back before midnight.
(= You can go to the party, but you must promise to be back before midnight.)
|As long as has the same meaning as providing or provided.||You can go to the party providing / provided you come back before midnight.
We're going skiing next week providing / provided there's enough snow.