An user English
says…

The
Determiner
  time
Noun
  must
Auxiliary
  have
Auxiliary
  been
Auxiliary
  somewhere
Adverb
  around
Adposition
  six o'clock
.

The time must have been somewhere around six o'clock.
Words and sentences
New
the

New
time

New
must

New
have

New
been

New
somewhere

New
around

New
six o'clock

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