عبارت be to مثل was to VERB یا is to VERB و موارد مشابه یعنی VERB قرار هست (plan) یا انتظار میره (expect) در آینده اتفاق بیفته
I am to see the doctor on Wednesday = I am going to see the doctor on Wednesday = I have an appointment with the doctor for Wednesday
He was to become the next CEO, but retired before that could happen = He was supposed to become the next CEO, but ... = It was planned that he would become the next CEO, but ...
خوب حالا وقتی به جای was حالت were باشه میگیم جمله شرطی (conditional) شده که خودتون گفتین میدونین
در رابطه با قسمت دوم سوالتون، I would be doing شرطی استمراری هست.