Put on a mask
The Spanish phrase 'ponerse una mascarilla' translates to 'put on a mask' in English. It may be used in various contexts, such as a reminder for personal safety measures during health crises or indicating the act of applying a facial beauty mask. 'Ponerse' is the reflexive form of the verb 'poner', which means 'to put'. 'Una' is an indefinite article equating to 'a', and 'mascarrila' specifically means 'mask'.
Before entering the hospital, it is necessary to put on a mask.
In this sentence, the action of putting on a mask is presented as a requirement or necessity before entering a hospital to prevent the spread of diseases.
If you want to avoid contagion, you should put on a mask when you are in public places.
In this sentence, wearing a mask is advised as a preventive measure against contagion when someone is in public places.
I would recommend that you put on a mask before using public transportation.
In this sentence, the recommendation of wearing a mask is given to the listener before they consider using public transportation.