Page 161 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

p+kagiri is used when a repeated or on-going action, event, or state lasts
2.
only until a certain time.

whether - or -; or
possibilities about which the

(J don't know whether or not I can go to Japan next year.)

(J don't remember well whether I left my umbrella at the station or in
my office.)

( i ) (V, 1 Adj(i),}inf 73. {V2 / Adj(i)~}inf *

4L6ri
&& /%/Vl?l 73. $&"pa /%$&Ll:I 73.
(whether s.0. plays / played or studies / studied)