Rasha Assem posted:
The Present Cont. and the 'be to do something' structure are both used to talk about future arrangements, so what's the difference, if there is any?
1) He is visiting Paris next week.
2) He is to visit Paris next week.
The basic difference between (1) and (2) is that, in (1), the "arrangement" or plan is presented simply as something that is going to occur.
In (2), which is more formal and less usual than (1), the plan really is an arrangement. He is officially scheduled to visit Paris next week.