A) It's Monday evening. Your father must be at home. He'll miss supper. Where is he?
b) — Mom. May I stay at Lisa's house at Sunday? Weather forecast predicts bad weather.
— Maybe they made a miatake?
— I'll go to the mountains on Tuesday.
c) I don't know how can I spend my weekend. Cat is lazy, computer is boring, friends might at Grannys... But I must call them.
d) What can I cook for friends? Maybe a cake? No, I can't cook it. Sandwiches? Yes, but I must cook something else. I can buy popcorn. We might see a film. I mustn't waste any minute!