need to, must, have to的区别？

need to需要做...解释：It's something that we should do or it's important to us to do.（表明这件事情很重要或者我们应该去做）I/They/We/You need toShe/He needs toI/They/We/You don't need to...She/He doesn't need to...I need to get my hair cut, it's out of control.我要去剪头发了，我的头发已经不受控制了。She needs to go to the dentist tomorrow.她明天需要看牙医。I need to make a phone call.我需要打个电话。have to/must①相同点：表达某事是一种义务，是一种必要的责任，或者某事是必要的。这件事不仅仅重要，还是必须的。解释：Something is an obligation, a necessity or a responsibility or something that is required.I have to/must get to my meeting on time.我必须按时参加会议。You have to/must have a passport to travel abroad.你出国得有护照。表示可能性解释：Something is likely.The heater must/has to be broken.加热器可能坏了。②不同点must通常指个人义务；have to通常用于外部的权威或规定I must turn off my phone when I study because it's too distracting.我必须在学习时关掉手机，因为它太让人分心。You have to turn off your phone during exams because it's a university rule.你必须在考试期间关掉手机，因为这是大学规定。

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