that although this structure is used to talk about current and future
arrangements and events, it is configurated in present and past
tenses - see the above examples. However, be to + perfect infinitive
is sometimes used to show that a planned event did not materialise:
- He was to have appeared in the West End show but broke his collar
bone during rehearsals.
- They were to have picked strawberries this morning, but the
torrential overnight rain made the field too muddy.
- Sammy was to have married Sarah but then Jamie came along and
the engagement ring he had given her was returned.