Alexander Koryagin:

AK> When a person is in a company of friends he never speaks
AK> formally. And he should not to.  It  is  too  loathsome,
AK> IMHO.
Correction:  "should  not"  or  "ought not to" (depending on
what you mean).

Formal and informal are  two  poles  with  natural  language
somewhere  in  between.  Informal language need not mutilate
words nor  cripple  grammar.   Remember,  for  example,  the
dialogs  in  our  screen adaptation of Captain Blood (1991).
Do you find them loathsome?

AK> As for "inside/inside of" formally you  are  right,  but
AK> there are many opinions on this account. For instance:
AK> [...]
AK> http://tinyurl.com/yxacrj6f

There  are more than one opinion on any matter, but there is
no  logical  justification  of   either   "inside   of"   or
"irregardless"   (for   another  example).   They  are  mere
uneducated distortions by people who do not care about their
language  and  culture  and  consequently  never  ponder and
wonder about the anatomy of words or their  functions  in  a
sentence.  But such people shall not decide the evolution of
the language.

AK> IMHO, they are just new words. Like a flash  mob,  blog,
AK> podcast etc. I don't like them, too.

Correction: I dislike them too, or I don't like them either.

AK> But the main feature of informal speech, AIUI, is making
AK> the talk more funny and humorous.  It's  like  I  see  a
AK> school boy and cite the Shakespeare' lines:
AK> -----Beginning of the citation-----
AK> ...the whining school-boy, with his satchel
AK>   And shining moaning face, creeping like snail
AK>   Unwillingly to school.
AK> ----- The end of the citation -----

Shakespeare  is  too difficult for me, who has read Tolkien,
E.R.Eddison, Poe, Lovecraft, and even John Bunyan.   I  feel
no  rhythm in this fragment, but see nothing missing save an
article before "snail".

AK> No, last time I don't read much - I have  problems  with
AK> my eyes. After work they are too tired. Before bed I can
AK> read 15 minutes, maximum. And I read some old stuff.

Proposed correction: "lately I haven't been reading much."

I wish you to  overcome  this  condition  somehow:  consider
exercise  for the eyes, medicine, frequent rest for muscular
relief, maybe consult a doctor.  Reading is too precious  to
give it up.

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 * Origin: nntps://fidonews.mine.nu - Lake Ylo - Finland (2:221/6.0)