Mollygo
Yes OP, There’s +plural is irritating but I find myself saying it (e.g. There’s still so many presents to wrap.) Lazy speech? Local usage? Dialect? (I want to know what the short shrift will be.😂😂)
Re was and were, I vaguely remember that
‘If I were’ instead of ‘If I was’ - is something to do with the subjunctive. However, ‘I were’ just sounds wrong.
As regards my ex colleague, it was not use of the subjunctive ‘were’ I meant. Just the usual sort of, ‘I were too hot/tired/hungry’ etc.
Talking of EFL teachers, a dd who taught EFL in sundry SE Asian countries and Australia, once had someone else’s students come to her in confusion, because their teacher apparently didn’t know the difference between its/it’s - or some such basic usage.
As she said, it was bloody embarrassing, especially since the fellow teacher was a Brit.