I wish you (let) me (know) you not (be able) to come a dinner. I certainly not (go) to all this trouble if I (know).

I wish you let me know you weren’t able to come a dinner. I certainly wouldn’t have gone to all this trouble if I had known.

athough we ( be ) have been in this village for a year so far, we (not know) haven't known many people yet

but by next door neighbors ( be ) was very helpful when we first (move) moved