[مستر محمد علام]

ده كلام من موقع اجنبي عن BE TO INFINITIVE

Be + to-infinitive is used to express:

• official arrangements:

  The Prime Minister is to visit India next month.

• official orders:

  At the end of the course, all students are to take a written exam.

• things that should be done:

  What am I to do?

• a possible aim when saying what should be done to reach it:

  If you are to work here for more than three months, you must have a residence permit.

• prohibition (only in the negative):

  You are not to do that again.

Be + to-infinitive can also be used in the past:

Mr Jones was to speak at the meeting. (it was arranged and he did)

But was/were + to + perfect infinitive means that the arranged event did not actually happen:

Mr Jones was to have spoken at the meeting, but he had to cancel because of his illness.