ПОМОГИТЕ Здесь ВСЕ ВСТАВЛЕНО Только объясните почему конкретно must should

ПОМОГИТЕ Здесь ВСЕ ВСТАВЛЕНО Только объясните почему конкретно must should и так дальше прошу

1 You should see a doctor if youre not feeling well. 2 You neednt do the washing up - Ive already done it. 3 That ought to be Tracey ringing the doorbell. She said she would come round. 4 If you miss school because you are sick, you have to get a note from the doctor. 5 May I have another slice of cake, please? 6 Tims story cant be true hes making it up! 7 Not many people can speak six languages. 8 I really must reply to Samanthas email. 9 I know you dont like Ben, but you could at least say hello to him. 10 Shall I carry those heavy bags for you?