To be to
To be to as a modal verb is used in the present and past tenses.
E.g. We are to meet at six.
We were to meet at six.
To be to as a modal verb has the following meanings:
a previously arranged plan or obligation resulting from the arrangement
E.g. We are to discuss it the following week.
Is he to arrive tomorrow?
Who was to speak at the meeting?
Mass struggle is vital if the elimination of the evils of racial hatred is to be guaranteed.(Daily Worker)
This meaning of to be to is found in affirmative and interrogative sentences in the present and past tenses. To be to is followed by the simple infinitive.
The past tense of the verb to be to in combination with the Perfect infinitive denotes an unfulfilled plan.
E.g. I promised to go to a club with her last Tuesday, and I really forgot all about it. We were to have played a duet together.
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