Thanks @e2efour Nice explanation. Is this Relative Clauses?The sentence could be written as:
The bathrobe that was hanging ...
This is often shortened by using only the -ing form of the verb (known as the participle).
The woman standing at the corner of the street
The women who stood/was standing at the corner of the street
I'm afraid it is not, it isAs I know, the structure should like this: S + to be + Ving.
The part "hanging on his bedpost" is known as a reduced relative clause. The full relative clause has been reduced from "The Jacquard bathrobe that was hanging on his bedpost bore the monogram: Hotel Ritz Paris"Why there isn't to be in this sentence?