This depends on what your trying to say.
If you are talking informally you would use (tú) when talking formally you would use (usted or in shortened form ud.)
Sister in law in Spanish is cunada.
How to say "hi" in spanish is Hola. How to say "bye" in spanish is Adios.
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you say it in spanish as- sarina
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To say stepfather in Spanish, you say padrastro.
To say 'knives' in Spanish, you would say 'cuchillos.'
To say 'evaporation' in Spanish, you would say 'evaporación.'