Page 681 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

zaru o enai 607
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(Because this many people have been murdered by guns, I feel that we
cannot help but control possession of guns more strictly.)
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(Since John was able to speak Japanese fluently and read newspapers
with ease in one year we cannot help calling him a genius of language
learning.)

1. Vneg zaru o enai is used in written Japanese to express an idea of 'can-
not help -ing.'
2. The irregular verb sum changes to se before zaru o enai, as shown in
Formation and Exs.(c) and (e).

3. Just like its English counterpart, the verb that can be used in Vneg zaru
o enai has to be a volitional verb, so a non-volitional verb such as
wakaru 'understand,' dekiru 'can,' tsukareru 'get tired,' komaru 'get into
trouble,' mieru 'can see' and every potential form cannot be used with
Vneg zaru o enai.

I. Vneg zaru o enai can be replaced by Vneg nakereba naranai when the
latter means 'have to do s.t. because there is no other choice.'