Page 417 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

for; in; since
(s.t. has continued up until the [ REL. -buri; irai; -kan; mae
moment of speech or s.t. has never kara ]

+Key Sentences

1 (Tom has been studying Japanese for the past 20 years.) I

(This winter is the coldest one in 50 years.)
=
-
-
-
-
-
-
% R
-
-
-
-
-
-
-
-
( i ) N (duration) %
z++% (for the past 30 years)
(ii) N (duration) %a) N
hh C LL
(the
%++%~kl&iS strongest earthquake in 60 years)
m3lmm
hR *WLo
(a) %z++%, w CH~E%&TL~ZT,
(My father has been employed in the same company for the past 30
years.)