SFX Magazine had declared the sentence below as follow: 1) STAR TURN, 2) BEST LINES.
I wish Bernard Cribbins was my grandad. Perhaps he would be willing to adopt?
Rattigan: “If only that was possible.”
The Doctor: “If only that were possible. Conditional clause.”
Is 'was' after 'I wish', 'if only' and 'if' (in conditional clauses) colloquial?
Does it be used in formal speech and writing?