k56
1 One ( must ) keep one's promise.必要・義務
2 You (may not ) speak ill of others.許可の否定、すなわち禁止
3 ( Can ) the news be true?疑惑
4 You (may ) stay here as long as you like.認容
5 We eat that we ( may ) live.目的
6 ( May ) you be happy!祈願
k57
1 The rumor may not be true.
2 His mother can not be ill.
3 You must not use my dictionary.
4 You need not do it as you are told.