Spanish phrase
Sí, si ~.
Meaning
Sure if ___.
When to use it
Expresses conditional willingness to assist. It is used in informal replies to show help will be offered only when required, somewhat noncommittal.
Example dialogue
¿Me ayudas con la mudanza este fin de semana?
Can you help me move this weekend?
Sí, si hace falta, te ayudo.
Sure if it's necessary, I'll help you.