Page 300 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

226 - nari - nari
KS(B) and Ex.(f) can be rewritten as [3] and [4].
-
(e tari - tari suru (DBJG: 458-61))

Both - nari - nari and - -tari - -tari list representative examples, but the
former sounds more assertive than the latter. (i.e., the speaker feels that
his choice is the proper one). So in a situation where the ~peaker'~
assertion is due, - -tari - -tan is not used.
t Lt3.L
[5] 53*r;ed.9r:c;, HP@T (i<~*b)/*S<f-bJI, &&
C: {W<&b! /*ML\ebJl L.51,
(If you cannot figure it out, do research at the library or ask
your professor.)

In [6a] and [6b] nari is ungrammatical, because Vinf.nonpast nari
Vinf .nonpast nari cannot be used with the past tense predicate.
[6] a. ~dlif~2~ {LkV /*bQ&b)) CD9 (i?!l'$~~\kbI /
*M<&bJI Lf:,
(Yesterday I did things like playing tennis and listening to
CDs.)
b. 749 {&~fPl /*f?.TC&blI, &a (B3fLbl/*%3&
6) I, t -c B% ~$19 k,
(Doing things like drinking sake and singing songs, we
enjoyed very much (lit. was very enjoyable).)
Tari in [7] is ungrammatical, simply because it cannot be connected
with a noun.

In [8] tari is ungrammatical, because tari expresses X and Y (and oth-
ers), whereas nari expresses X or Y (or s.t.).