Mr.Sato took a trio during September.
(特定の期間を表すduring)
The scientists have been trying to research about cosmo for more than three days
(数詞を伴う期間)
I've been wainting him whlle he finished the exam.
(while + S V )
今日は基幹のお話。
よくfor ,sinc
other,anotherのニュアンス理解
例：Some of the apartments we saw were too small and others were too large.
(私たちが…
