やってみよう: Woman: Why weren't you at the party last night? Man: I ___ study for a test. 男の人のせりふを選んでください。 (had to / didn't have to / has to) 答え: had to — 彼は昨夜、試験のためにパーティーに行けなかったので、勉強しなければならなかったのです：had to。
didn't have to + 動詞
ルールがなくて自分で選べたときは didn't have to + 動詞を使います。
I didn't have to go to school today.
やってみよう: Man: Was the form long? Woman: No. I ___ write much. Just my name and address. 女の人のせりふを選んでください。 (didn't have to / had to / don't have to) 答え: didn't have to — 書類には名前と住所だけでよかったので、たくさん書く必要はありませんでした：didn't have to。
疑問文：Did you have to …?
過去のルールについてたずねるときは Did you have to + 動詞? と言います。
Did you have to wear a uniform at school?
Did he have to pay for the ticket?
やってみよう: Man: ___ get up early for the trip? Woman: Yes. The train left at six, so I got up at five. 男の人のせりふを選んでください。 (Did you have to / Do you have to / Did you forget to) 答え: Did you have to — 旅行はもう終わっていて、電車の時間のせいで彼女は5時に起きたので、彼は Did you have to とたずねます。