In British English when a verb ends in a single vowel followed by a consonant, we generally double the consonant when putting the verb into gerund or past form.
在英式英语中，当一个动词的结尾单元音跟着辅音的时候，这个动词的动名词或过去时，最后的辅音字母经常是双写的。
Gerund has the characteristics of both verb and noun, and it has its own logical subject, which may be the same as the main sentence's subject or may not.
动名词具有动词和名词的特征，它有自己的逻辑主语，这个主语可以是句子的主语也可以不是。
The gerund and infinitive form of a verb suggests that some sort of plan was made earlier before the event occurs and there is no assurance that the event will actually occur.
动词的动名词形式和不定式，表达了事件发生前设想好的某种计划，也不保证事件一定会发生。
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