—He perdido las llaves. —No te preocupes, tengo copia.
"I've lost the keys." "Don't worry, I have a copy."
No te preocupes por el dinero, yo pago.
Don't worry about the money, I'll pay.
Remember no te preocupes for good. ripiti brings the word back just before you forget it, with these sentences. Free, no account needed, works offline.