Por favor, espere un momento, tengo que buscar mi cuaderno.
Please wait a minute, I have to get my notebook.
Hable más fuerte por favor.
Please speak louder.
Por favor, hable más despacio.
Please, speak slower.
Must not do.
Por favor, no grite en el teléfono.
Please, do not yell over the phone.
In Spanish, you can use 'usted' for respectful commands. Three things to command are to submit homework on time, speak clearly, and keep the classroom clean. Two things not to do are to talk during presentations and use the phone in class.
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