Bear in mind that we sometimes combine si + El Presente, deber/tener que in El Condicional; this is also often expressing advice.
See some examples:
Site gustan esos pendientes, deberías comprarlos.If you like those earrings, you should buy them.
Si ellos son los responsables, deberían pagar.If they are responsible, they should pay.
Siquieres este trabajo, tendrías que llevar este uniforme todos los días.If you want this job, you'd have to wear this uniform everyday.
Sicambian la fecha del examen, tendrían que avisar con tiempo.If they change the date of the exam, they'd have to warn [us] in time.
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Sives a Juan, dile que venga.If you see Juan, tell him to come.Sicocinas esta noche, ponte el delantal.If you cook this evening, put the apron on.Siestudias español, compra un buen diccionario.If you study Spanish, buy a good dictionary.Sibebes, no conduzcas.Don't drink and drive. (lit: If you drink, don't drive.)Sivas a la playa, no tomes el sol demasiado.If you go to the beach, don't sunbathe for too long.Si vosotros salís, cerrad la puerta.If you go out, lock the door.Si ellos son los responsables, deberían pagar.If they are responsible, they should pay.Site gustan esos pendientes, deberías comprarlos.If you like those earrings, you should buy them.Siquieres este trabajo, tendrías que llevar este uniforme todos los días.If you want this job, you'd have to wear this uniform everyday.Sicambian la fecha del examen, tendrían que avisar con tiempo.If they change the date of the exam, they'd have to warn [us] in time.