Usages of por si
Guardamos las mochilas en el maletero y dejamos una manta por si hacía frío.
We put the backpacks in the trunk and left a blanket just in case it was cold.
Llevo una chaqueta extra por si hace frío esta noche.
I bring an extra jacket in case it is cold tonight.
Siempre miro el escaparate de la librería antes de entrar, por si veo algún libro interesante.
I always look at the bookshop window before going in, in case I see an interesting book.
Llevo guardados todos los tickets del mes por si tengo que pedir alguna devolución.
I’ve kept all the receipts from this month in case I need to ask for a refund.
Aunque la pediatra dijo que estaba bien, la madre tendrá cuidado por si vuelve la rabieta.
Although the pediatrician said she was fine, the mother will be careful in case the tantrum comes back.
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