This structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." can express arranged eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head.s.

The concert was to begin at 6.

However, if the planned event did not happen, we use be to + perfectThe aspect expressing completion. E.g.: He’s finished university. infinitive:

You were to have tidied your room this morning.

This structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." can express arrangements and orders.

The concert is to begin at 6. (arrangement)
You are to tidy your room before your friends get here. (order)

We can use this structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." for actionA general term expressing that somebody or something does somethings happening at determined or known times in the future:

The film is due to start in 2 minutes.
Half of our employees are due to retire in five years.

This structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." is used for formalNot belonging to colloquial or everyday speech; official. E.g.: I demand that Mr Smith call the person on whom the committee has decided., official arrangements.

All students are to take the Academic English Exam at the end of the first year.
"Clone expert is to clone human embryos".
"The Prime Minister is to visit Pakistan next month".

We can use the future continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. for fixed arrangements and plans in the same way as we use the present continuous, although in this case these may be less definiteRelating to a specific or determined person, thing, idea or time. E.g.: I know the guy you are talking about. ("the guy you are talking about") and formalNot belonging to colloquial or everyday speech; official. E.g.: I demand that Mr Smith call the person on whom the committee has decided..

The band will be performing live sometime in October.
We will be arriving in Szeged soon.

The present continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. can express fixed social or travel arrangements and plans for the future. Note that you need to use a time expressionA word or group of words used in a particular situation. E.g.: Good morning, at six, on the sofa or some reference to future, otherwise the sentence would refer to present time.