Question

あ。

(7)についてです。この文章の斜体の動詞を過去形にかえなければならないのですがどうしてmustがmightにならないのかが分かりません。時制の一致が必要ではないのでしょうか？
正しい解答→My teacher said I must speak up.
私の回答→My teacher said I might speak up.
範囲は英語表現Ⅱの話法です！

2) Yuji says he has been to Disneyland twice.
斜体の動詞を過去形にして全文を書きかえなさい。
Tim thinksl am_responsible for the accident.
2) She knows I was very sleepy during the class.
A) I 200nder if Mary will like my present for her.
~ 5) I hear John gave up his job for health reasons
6) I see Saki can dance well.
My teacher says I must speak up.
8) I think we should carry out the plan immedia
An

英表 英表ⅱ 話法 助動詞過去 must