You should eat lunch.你应该吃午餐.You shounldn't do that again.不要在这样做了.You must do the homework.你必须做作业.You mustn't take me too seriously.你不要对我太认真.You had to wash his hand this mon... You should eat lunch.你应该吃午餐.You shounldn't do that again.不要在这样做了.You must do the homework.你必须做作业.You mustn't take me too seriously.你不要对我太认真.You had to wash his hand this mon...