Postposition /de/ 'in'

I read books in a cafe.
(= Talking about me, I read books in the cafe.)

I read books --> わたしは　ほんをよみます
the cafe --> きっさてん /kissaten/
The event described by /yom/ 'read; will read' has two roles: one the actor, and the other the undergoer.

1) わたしはほんをよみます。
I-TOPIC book-OBJECT read-Nonperf

Key 1: The form /de/ describes the relation describied by the preposition /in/ in English that holds between the place where an event occurs and that event.
Key 2: Since every clause (or sentence) describes an event, every clause (or sentence) CAN co-occur with a /de/ phrase describing an event-occurring place.
Key 3: There is no difference in the truth-conditional meanings between a clause with an order among a SUBJECT phrase, an OBJECT phrase, topic phrases, and postpositional phrases and another clause with a different order among them.

N.B. The form /de/ is also used, e.g., as the instrument postposition in Japanese, whose counterpart in English is 'by'.

2) きっさてんでわたしはほんをよみます。
cafe-in I-TOPIC book-OBJECT read-Nonperf

The phrase きっさてんで /kissaten-de/ modifies the event, and it must occur before the verb that describes that event.