Request for Articles Dealing with Constructions with the Russian Conjunction chtoby

[Spencer Robinson]

Dear SEELANGers,

I am trying to find articles/information about the alternations between
null~chtoby and chto~chtoby as in the following examples:

(1) Ja idu pokupat' mashinu. (Я иду покупать машину).

(2) Ja pishu, chtoby kormit' sem'ju. (Я пишу, чтобы кормить семью).

(3) On boitsja, chto ona zabluditsja. (Он боится, что она заблудится).

(4) Oni bojatsja, chtoby on ix ne uslishit. (Они боятся, чтобы он их не
услышит).

I have found a little information in Timberlake's Russian grammar, but other
than that I am stumped. Does anyone know of any resources on this subject?

Thank you in advance!

Sincerely,
Spencer Robinson

--
S. Spencer Robinson

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