as long as

Used to say that something is possible or allowed only if a condition is met.

• You can stay as long as you're quiet.
• I'll help as long as you listen.
• We can go tomorrow as long as it doesn't rain.

How to use it: as long as + clause (You can borrow my bike as long as you bring it back.)

Similar words: provided that, so long as, if

Common phrases: as long as safe, as long as permitted

During the whole time that something is true; sometimes used to give a reason based on the present situation.

• I'll stay as long as you need me.
• She loved music as long as she lived.
• As long as you're here, you could help us pack.

How to use it: as long as + clause (I'll look after the dog as long as you're away.)

Similar words: while, for as long as, since

Common phrases: as long as possible, as long as necessary

Used to say that something can happen if a particular condition is met.

• I'll come as long as you're there.
• We can play outside as long as we stay nearby.
• She agreed to lend it as long as I returned it soon.

How to use it: as long as + clause (You may use the room as long as you leave it tidy.)

Similar words: provided that, so long as, if

Common phrases: as long as safe, as long as permitted

Used to compare lengths or times, or say that something may last a surprisingly long time.

• Your scarf is as long as mine.
• We waited as long as two hours.
• The new path is as long as the old one.

How to use it: as long as + length or duration (The journey can take as long as six hours.); as long as someone/something (This rope is as long as that one.)

Common phrases: as long as mine, as long as yours