شَاءَ: أرَادَ to want, wish, desire, will, be willing (to); to intend, purpose, have in mind

شَاءَ أمْ أبَى ـ اُنْظُرْ: أبَى

إنْ شَاءَ اللّهُ God willing, please God, if it is God's will, if it pleases God, let's hope so, I hope so, it is to be hoped

إلَى مَا شَاءَ اللّهُ forever, forever and ever, eternally, perpetually; for good, permanently