An user English
says…

It
it
Pronoun
  is
Auxiliary
  so
Adverb
  very good
  that
Subordinating conjunction
  it's
  good for nothing
.

It is so very good that it's good for nothing.
Words and sentences
it
New
it

New
is

New
so

New
very good

New
that

New
it's

New
good for nothing

Alternative form of good-for-nothing

👍
New
good

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