اقتباس:
	
	
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					المشاركة الأصلية كتبت بواسطة 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.
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بارك الله فيك مستر محمد و اعظم لك الاجررررررررررررر