supply and demand は「需要と供給」であって、「供給と需要」は×。remains to be p.p. / make allowances for ~、etc.
上級解釈の開始。文の構造ばかりか、訳語の選択である。一つ例を挙げれば the relative emphasis であり、medium、etc.
and it never occurred to me that they could talk with assurance of what they did not know much about.
It was long before I realized the only thing that mattered to me in a wok of art was what I thought about it.
推量・肯定の断定・否定の断定。She may know the secret. She must know the secret. She can’t know the secret.
may (must/can) have p.p. の 5 分復習して、今日の課題は should (ought to / had better ) have p.p.