mustn't 与shoudn't用法如何区别

mustn't 与shoudn't用法如何区别 mustn't的用法? mustn't的用法 mustn't与needn't的用法区别 can`t与mustn`t意义和用法的区别 请问英语中couldn't wouldn't needn't mustn't的区别与用法? mustn't neendn't can't 的用法 students shoudn't be late ()school needn't 与mustn't的区别? must,need,mustn't,needn't的用法? can‘t be 和mustn’t be的用法 I didn’t see her in the meeting-room this morning.She____at the meeting. （d） A.mustn’t have spoken B.shoudn’t have spoken C.needn’t have spoken D.couldn’t have spoken mustn't needn't Shall I tell John about it?－No,you_________.I’ve told him already.A.needn’t B.wouldn’t C.mustn’t D.shoudn’t应选什么?为什莫? --have been told to be there on time.--,you____.They have changed the plan.A.mustn't B.can't C .shoudn't D.needn't这里我觉得是选D.但是我不确定.所以请高人指教! may not/can't/couldn't/needn't/mustn't举例区别意思和用法 can’t mustn’t shouldn’t needn’t 在用法上怎么区别? mustn't/can't/won't/shan't的用法和区别,请详细一点.