use + full = useful(但是要注意副词形式为 usefully)如果需要加后缀的词本身也是以 ll 结尾,那么这一词的第二个 l 也要省略:
skill+full = skilful
注意:
full + fill = fulfil
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.