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Which words does it include?
According to a recent research, to enable to reading a wide range of context English text, English learners need 8,000-9,000 word family at least. This research is based on another one suggested that to comprehensive language content, readers have to decode 98% lexicons.

Word family has three parts, root word, reflexive forms and derivative form. For example, says 'able' is the root word, reflexive forms include abler, ablest and reflexive forms from derivative form, ability, inability, ably, etc are derivative forms.

However, the importance of every thousand word family is not equal. The first 1000 word family cover about 80% lexicons, so these are the most important one. After that, 2nd and 3rd is 9% and 4%, respectively. These three thousand word family is the first level to learn. The second level is 4th-5th word family, which coverage is 3%. The last not the least level is 6th-9th thousand that has four thousand words, just include 2% lexicons.

What does it mean to learn a word?
After 9th thousand, those are low frequency words, were learnt by using etymology strategies. For the first 9000 word family, I'm going to learn them and note in this dictionary. For content word(noun, verb, adjective and adverb), I plan to learn four parts of word, meaning include synonym, frequency, word family and collocation. Each lemma can stand for several words, for each word it has several meaning. To learn all meanings of word and its related synonyms to use it in correct context. Knowing the frequency of word can assist I how to use it. Then I need to know the word family, to get more flexibility to express. To write and speak nature, I need to learn word collocation. For function word, the better way to learn it is through grammar book but dictionary. In the future, may be include pronunciation note, for example, linking, deletion of sound in phrase.