Working in a blacksmith's forge requires a lot of safety precautions. When you take a specific action to prevent a negative or unwanted outcome, you use a precautionary clause. In English, we usually translate these as "just in case" or "lest".
no sea que
The phrase no sea que is a common way to express negative purpose. Because it describes a hypothetical event that you are actively trying to avoid, the verb that follows it must always be in the subjunctive.
| Do not leave the metal there, hold it on the anvil, just in case it falls. | No dejes el metal ahí, sujétalo en el yunque, no sea que se caiga. |
| Always use glasses when forging, just in case a spark damages your eye. | Siempre usa los lentes al forjar, no sea que una chispa te dañe el ojo. |
| I will temper the metal, just in case you cool it too soon. | Yo templaré el metal, no sea que lo enfríes demasiado pronto. |
no vaya a ser que
You will also frequently hear no vaya a ser que. This phrase means exactly the same thing as no sea que and is used interchangeably. Just like no sea que, it is always followed by the subjunctive.
| Take the burning iron with the tongs, lest you burn yourself. | Toma el hierro ardiente con la pinza, no vaya a ser que te quemes. |
| I will have to melt the metal, lest the mold break. | Tendré que derretir el metal, no vaya a ser que el molde se rompa. |
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