In regard to the construction "be + infinitive", which is usually used for the purpose of giving an instruction, is it still acceptable to use it to express that intention in the continuous form as in the examples below?
The boss writes that we are all to be waiting in the office for his arrival on Monday morning.
But is it still grammatical to use the continuous form in more or less passive sentences? such as:
I was to watch/be watching the entrance gate should anyone suspicious be lurking around the area.
As instructed by my teacher I am to study/to be studying right now.