Page 418 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

ItL**?
(b) %ZDW %%+$%%I? -c3 3 Lk,
(I've been continuing this research for the past 10 years.)
<
7:
(c) &Y%D%fi9, i 9 1$-3 1 3 7Zo
(The rain which started after midnight appeared to have finally
stopped.)
(d) 54 2 El% 2 12 Ef$%D2%Zo
(Okada and I have been fiends for the past 40 years.)
-
(el ++D%CAA++%D~S I?+ i 72,
(They say that this summer is the warmest in 60 years.)
(f) z ~LCAZ+$%DT&%
(This is the heaviest snow we have had in 30 years.)

1. When -mi is used to mean s.t. has continued up until the moment of
speech, the final predicate takes Vte iru as in KS(A) and Ex.(a) or Vte
kurv as in Ex. (b).

2. X wa N (of duration)-mi no Y da as exemplified by KS(B), Exs.(e) and
(f), means that as for X, the speaker has never experienced Y in the
specified duration. When Y is a person as in Ex.(d), -mi means X has
continued to have the status of Y for a certain amount of time.

I. -mi is used with an expression of time duration. The following phrases
are all ungrammatical because the nouns used here express a point of
time. To make them grammatical phrases -imi has to be used.

b. *I990 $% (cf. 1990 $U% (since 1990))

d. *%&c (cf. Q+U% (since last year))

e. *Q$o%% (cf. &$D$kN% (since last fall))