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Auxiliary Verbs
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字母
Letters
词汇
Vocabulary
would
might
will
do
短语
Phrases
动词变化
Verb Conjugations
非有限
non-finite
动词不定式
infinitive
过去分词
past participle
动名词
gerund
指示
indicative
当前
present
过去
preterite
势在必行
imperative
势在必行
imperative
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