is an alternation of ことになる
, a grammar point showing that something has been decided by someone other than the speaker. It is a combination of the nominalizing use of こと (for creating noun-phrases), and the ている-form of the う-Verb なる ‘to become’. The primary difference between ことになる
is that the latter focuses more on that something is ‘expected to (A)’, or ‘scheduled to (A)’. In other words, it is ‘becoming that (A)’, but has not actually happened yet.
This structure is often used after either the る or ない versions of verbs, in order to highlight the action which either is not not ‘expected’, or ‘scheduled’ to occur. Let’s take a look at the ‘scheduled to’ meaning first.
The class is scheduled to start at 12.
The president is scheduled to not come to the party next week.
When indicating that something is ‘expected to (A)’, this is an example of ている’s use for expressing habitual or ongoing actions/states that reoccur under some specific set conditions.
It is expected for customers to get into the cab from the left side.
Students are expected to not leave the classroom during class.