should - You ___ wear a helmet when riding a bike., can - She ___ play the piano very well., must - We ___ leave early if we want to catch the train., Could - ___ you help me with my homework?, can't - They ___ be at home; the lights are off., might - I ___ go to the party, but I'm not sure yet., must - Students ___ bring their own calculators to the exam., may - He ___ have taken your book by mistake., mustn't - You ___ smoke in this area; it's prohibited., May - ___ I borrow your pen, please?, have to - We ___ finish this today, or the project will be late., must - She ___ be very tired after working all day., should - You ___ go to the doctor if the pain continues., could - He ___ run faster when he was younger., might - They ___ have forgotten about the meeting.,

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