as long as

siempre que, con tal de que

Indica que algo solo es posible o está permitido si se cumple una condición.

En inglés sencillo: 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.

Cómo se usa: as long as + clause (You can borrow my bike as long as you bring it back.)

Sinónimos: provided that, so long as, if

Expresiones frecuentes: as long as safe, as long as permitted

mientras, ya que

Indica todo el tiempo que dura una situación; a veces presenta esa situación como motivo para algo.

En inglés sencillo: 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.

Cómo se usa: as long as + clause (I'll look after the dog as long as you're away.)

Sinónimos: while, for as long as, since

Expresiones frecuentes: as long as possible, as long as necessary

siempre que, con tal de que

Indica que algo puede ocurrir si se cumple una condición concreta.

En inglés sencillo: 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.

Cómo se usa: as long as + clause (You may use the room as long as you leave it tidy.)

Sinónimos: provided that, so long as, if

Expresiones frecuentes: as long as safe, as long as permitted

tan largo como, hasta

Compara longitudes o duraciones, o destaca que algo puede durar un tiempo sorprendentemente largo.

En inglés sencillo: 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.

Cómo se usa: 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.)

Expresiones frecuentes: as long as mine, as long as yours