Sometimes it is necessary to divide a word at the end of the line because there is not enough space for the completion of the word.
These days many computer programs automatically take care of this problem for you. However, if you are using a typewriter or handwriting on stationary it is useful to know these rules.
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RULES FOR DIVIDING WORDS
Here are the most important rules to follow when dividing a word
By syllable: Divide the word by syllables or units of sound. For example, important, im-por-tant - 'important' has three syllables; thinking, think-ing - 'thinking' has two syllables
按音节切分。切分时以音节或音素组合为单位切分。比如important, im-por-tant - 因为important这个单词有3个音节。thinking, think-ing - 'thinking' 有两个音节。
By structure: Divide the word into the smaller units of meaning from which the word is constructed. It may have a beginning (a prefix) such as un-, dis-, im-, etc., (im-portant, dis-interested) or an ending (a suffix) such as -able, -fully, (as in desirable, desir-able).
按结构切分。按照组成单词的最小意义单位（词根）来划分。一个单词可能有前缀（如un-, dis-, im-, 等，im-portant, dis-interested）、后缀（如-able，-fully, 如单词desirable中的desire-able。
By meaning: Decide how each part of the divided word is best understood in order that the word is easily recognized from the two parts. For example, compound words such as houseboat made up of two words combined to make a single word, house-boat.
Here are six further rules to help you decide when and how to divide words.
1. Never divide a word within a syllable.
2. Never divide an ending (suffix) of two syllables such as -able or -fully.
5. Never divide a word of one syllable.
6. Never divide a word of fewer than five letters.