I needn't have written to him because he phoned me shortly afterwards．
我本来不需要给他写信，因为不久之后他就给我打了电话。（但我的确写了，因而浪费了时间。）
You needn't have brought your umbrella for we are going by car．
你本来不用带雨伞，因为我们将要坐车去。（但是你却多余地带了伞。）
He needn't have left home at 6:00；the train doesn't start till 7:30．
他本不必6点就离开家；火车7点30分才出发。（因此他要等一个小时。）
You can memorize words in an efficient way if you pronounce them reasonably. Say words correctly, and you will learn them easily. Correct pronunciation means correct spelling of the words. English spelling is not good to guide its pronunciation. But spelling and pronunciation have closed relationship. They match each other perfectly. Sometimes we can pronounce a word according to its spelling. English pronunciation can also guide its spelling. This is a two-way communication.
