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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