برای کاری که توی گذشته لازم بود انجام بدی، از had to + فعل استفاده کن.
had to + فعل
I had to walk home last night.
She had to take the bus.
خودت امتحان کن: Woman: Why weren't you at the party last night? Man: I ___ study for a test. حرفِ اون مرد رو انتخاب کن. (had to / didn't have to / has to) جواب: had to — دیشب به خاطرِ امتحان مهمونی رو از دست داد، پس مجبور بود درس بخونه: had to.
didn't have to + فعل
وقتی قانونی نبود و می‌تونستی انتخاب کنی، از didn't have to + فعل استفاده کن.
I didn't have to go to school today.
خودت امتحان کن: Man: Was the form long? Woman: No. I ___ write much. Just my name and address. حرفِ اون خانم رو انتخاب کن. (didn't have to / had to / don't have to) جواب: didn't have to — فرم فقط اسم و آدرسش رو می‌خواست، پس لازم نبود زیاد بنویسه: didn't have to.
Did you have to …؟ (لازم بود…؟)
برای پرسیدن درباره‌ی یه قانون توی گذشته، بگو Did you have to + فعل؟
Did you have to wear a uniform at school?
Did he have to pay for the ticket?
خودت امتحان کن: Man: ___ get up early for the trip? Woman: Yes. The train left at six, so I got up at five. حرفِ اون مرد رو انتخاب کن. (Did you have to / Do you have to / Did you forget to) جواب: Did you have to — سفر تموم شده و ساعتِ قطار باعث شد ساعتِ پنج بیدار شه، پس مرده می‌پرسه Did you have to.