常见考点
4. 表「义务、必须」must& have to
1)must：主观必须（说话人内心觉得应该），无时态变化
Wemust obey school rules.
2)have to：客观不得不（外界压力、客观情况迫使），有时态变化has to/had to
It rained heavily, so I had to stay at home yesterday. （内心可能并不情愿，迫于形势而为）
3)must引导一般疑问句 提问“必须做…吗？”
肯定回答：Yes，you must.
否定回答：No, you needn’t = don’t have to：不必，没必要(否定回答一定不用mustn’t，mustn’t表禁止，不准)
真题小练
1. （23宿迁）According to the traffic rules, people ________ ride e-bikes without wearing helmets.
A. mustn’t
B. needn’t
C. may not
D. might not
2.（23南通）If a football team wants to enter the World Cup, it ________ become a member of FIFA first.
A. may
B. must
C. can
D. might
3. （24南通）—Must I use pink to paint my bedroom?
—No, you ________. You can use any colour you like.
A. can’t
B. mustn’t
C. shouldn’t
D. needn’t
4. （25镇江）It is a rule that passengers ________ smoke in the high-speed railway.
A. wouldn’t
B. needn’t
C. mustn’t
D. couldn’t
