must ， have to ，need的用法和区别

I must water the garden first.

我得先给花园浇水。

must

必须(是必须要做的事情,着重于主观的看法（责任,命令）)

• We must be honest and faithful to the people.
  我们对人民必须忠诚老实。

• You must be willing to reskill.
  你必须乐于学习新技术。

• We must not forget your birthday.
  我们一定不能忘了你的生日。

Don’t you remember? I had to water it every day.

你不记得了吗？我不得不每天浇水。

have to

不得不(是内心不情愿,但是必须去做,有强迫的意思 )

• I have to go and cook the dinner
  我得去做饭了。

• He has to get out and shovel snow
  他得出去铲雪。

• I felt I had to give him a chance.
  我觉得我得给他个机会。

It’s raining. That means you needn’t water the garden.

下雨了，这就是就是说，你不必给花园浇水了。

need

需要（有这个需要和必要去做某事,可以不做）

need to do ;need not do

需要做../; 不需要做...

• She need not know I'm here.
  她不必知道我在这儿。

• We need to take responsibility for looking after our own health
  我们必须对自己的健康负责。

• At work you need to be able to concentrate
  工作的时候必须要做到聚精会神。

need doing （= need to be done）

需要被做

• Does this washer need repairing (to be repaired) now?
  这台洗衣机需要修吗？

• Your shoes need washing (to be washed).
  你的鞋需要洗了

• My hair needs cutting（to be cut ）, but I hate waiting in barber's shop.
  我的头发应该理了，但我不喜欢在理发室等侯。

  
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