Rugxdoma:"Se vi estas preta..."
"Se vi estas pretaj..."
"Se oni estas preta..."

If you are ready... is in Russian :
Если ты готов ... (you are male)
Если ты готова ... (you are female)
Если вы готовы ... (gently; you are single or plural)
Do you need to distinct this also?

sergejm:

Rugxdoma:"Se vi estas preta..."
"Se vi estas pretaj..."
"Se oni estas preta..."

If you are ready... is in Russian :
Если ты готов ... (you are male)
Если ты готова ... (you are female)
Если вы готовы ... (gently; you are single or plural)
Do you need to distinct this also?

Even worse:

If you are ready... is in Spanish:
Si tú estás listo... male, singular, informal
Si tú estás lista... female, singular, informal
Si vos estás listo... male, singular, informal
Si vos estás lista.... female, singular, informal
Si vosotros estáis listos... male or mixed, plural, informal (Europe)
Si vosotras estáis listas... female, plural, informal (Europe)
Si usted está listo... male, singular, formal
Si usted está lista... female, singular, formal
Si ustedes están listos... male or mixed, plural, formal (Europe) or formal and informal (America)
Si ustedes están listas... female, plural, formal (Europe) or formal and informal (America)

You can also (and normally would) drop the pronoun in all of the above sentences.