What are the differences between "be to" and "have to"? Please explain.
1)a) I am to do it.
1)b) I have to do it.
2)a) We are to invite you.
2)b) We have to invite you.
1)a) I am to do it. Someone in a position of authority over me has ordered me to do it. 1)b) I have to do it.
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1)b) I have to do it. It's necessary that I do it. I am obliged to do it.
2)a) We are to invite you. Someone in a position of authority over us has ordered us to do it.
2)b) We have to invite you. It's necessary that we do it.